{"id":1698,"date":"2020-04-12T03:14:16","date_gmt":"2020-04-12T02:14:16","guid":{"rendered":"http:\/\/xmau.com\/wp\/ilpost\/?p=1698"},"modified":"2020-05-18T16:35:53","modified_gmt":"2020-05-18T15:35:53","slug":"problemini-per-pasqua-2020","status":"publish","type":"post","link":"https:\/\/xmau.com\/ilpost\/2020\/04\/12\/problemini-per-pasqua-2020\/","title":{"rendered":"Problemini per Pasqua 2020"},"content":{"rendered":"<p>Vorrete mica che un banale coronavirus blocchi la tradizione dei problemini pasquali? Anzi, tanto a Pasquetta la gita fuori porta non la possiamo fare, quindi tanto vale cimentarsi nella risoluzione. La fonte stavolta \u00e8 il libro di Hugo Steinhaus <i>One Hundred Problems in Elementary Mathematics<\/i>. <\/p>\n<p><b><big>1. Moltiplicazioni in catena<\/big><\/b><br \/>\nPartite con i numeri 2 e 3 affiancati, e moltiplicateli tra loro: otteniamo 6. Aggiungete 6 alla (ancora breve) lista, lasciate da parte il 2 che \u00e8 il primo numero a sinistra, e moltiplicate 3 per 6, ottenendo 18. Aggiungete alla lista 1 e 8 e lasciate da parte il 3. I primi due numeri rimasti sono 6 e 1, che moltiplicati fanno 6; lo aggiungete alla lista lasciando da parte l&#8217;8. Andando avanti, costruirete una lista infinita che comincia con 2, 3, 6, 1, 8, 6, 8, 4, 8, &#8230; Dimostrate che questa lista non conterr\u00e0 mai le cifre 0, 5, 7, 9.<!-- problema 1 --><br \/>\n<a href=\"https:\/\/i0.wp.com\/xmau.com\/wp\/ilpost\/wp-content\/uploads\/sites\/4\/2020\/03\/q451a.png\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"1699\" data-permalink=\"https:\/\/xmau.com\/ilpost\/2020\/04\/12\/problemini-per-pasqua-2020\/q451a\/\" data-orig-file=\"https:\/\/i0.wp.com\/xmau.com\/ilpost\/wp-content\/uploads\/sites\/5\/2020\/03\/q451a.png?fit=507%2C79&amp;ssl=1\" data-orig-size=\"507,79\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"q451a\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/xmau.com\/ilpost\/wp-content\/uploads\/sites\/5\/2020\/03\/q451a.png?fit=507%2C79&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/xmau.com\/wp\/ilpost\/wp-content\/uploads\/sites\/4\/2020\/03\/q451a.png?resize=507%2C79\" alt=\"\" width=\"507\" height=\"79\" class=\"aligncenter size-full wp-image-1699\" srcset=\"https:\/\/i0.wp.com\/xmau.com\/ilpost\/wp-content\/uploads\/sites\/5\/2020\/03\/q451a.png?w=507&amp;ssl=1 507w, https:\/\/i0.wp.com\/xmau.com\/ilpost\/wp-content\/uploads\/sites\/5\/2020\/03\/q451a.png?resize=300%2C47&amp;ssl=1 300w\" sizes=\"auto, (max-width: 507px) 100vw, 507px\" \/><\/a><br \/>\n<!-- Cominciate a dimostrare che nella lista non ci sono due cifre dispari consecutive. --><\/p>\n<p><b><big>2. Tocca non ripetersi<\/big><\/b><br \/>\nRiprendete la lista infinita del problema precedente; dimostrate che non diventer\u00e0 mai periodica.<br \/>\n<a href=\"https:\/\/i0.wp.com\/xmau.com\/wp\/ilpost\/wp-content\/uploads\/sites\/4\/2020\/03\/q452a.png\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"1700\" data-permalink=\"https:\/\/xmau.com\/ilpost\/2020\/04\/12\/problemini-per-pasqua-2020\/q452a\/\" data-orig-file=\"https:\/\/i0.wp.com\/xmau.com\/ilpost\/wp-content\/uploads\/sites\/5\/2020\/03\/q452a.png?fit=437%2C88&amp;ssl=1\" data-orig-size=\"437,88\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"q452a\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/xmau.com\/ilpost\/wp-content\/uploads\/sites\/5\/2020\/03\/q452a.png?fit=437%2C88&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/xmau.com\/wp\/ilpost\/wp-content\/uploads\/sites\/4\/2020\/03\/q452a.png?resize=437%2C88\" alt=\"\" width=\"437\" height=\"88\" class=\"aligncenter size-full wp-image-1700\" srcset=\"https:\/\/i0.wp.com\/xmau.com\/ilpost\/wp-content\/uploads\/sites\/5\/2020\/03\/q452a.png?w=437&amp;ssl=1 437w, https:\/\/i0.wp.com\/xmau.com\/ilpost\/wp-content\/uploads\/sites\/5\/2020\/03\/q452a.png?resize=300%2C60&amp;ssl=1 300w\" sizes=\"auto, (max-width: 437px) 100vw, 437px\" \/><\/a><br \/>\n<!-- A un certo punto ci sono tre 8 consecutivi. Che succeder\u00e0 in seguito? --><\/p>\n<p><b><big>3. Non proprio Fermat<\/big><\/b><br \/>\nDimostrate che l&#8217;equazione <i>x<sup>n<\/sup><\/i> + <i>y<sup>n<\/sup><\/i> = <i>z<sup>n<\/sup><\/i> non ha soluzioni intere positive se <i>n<\/i> &ge; <i>z<\/i>.<!-- problema 5--><br \/>\n<img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"1706\" data-permalink=\"https:\/\/xmau.com\/ilpost\/2020\/04\/12\/problemini-per-pasqua-2020\/q453a\/\" data-orig-file=\"https:\/\/i0.wp.com\/xmau.com\/ilpost\/wp-content\/uploads\/sites\/5\/2020\/04\/q453a.png?fit=479%2C122&amp;ssl=1\" data-orig-size=\"479,122\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"q453a\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/xmau.com\/ilpost\/wp-content\/uploads\/sites\/5\/2020\/04\/q453a.png?fit=479%2C122&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/xmau.com\/wp\/ilpost\/wp-content\/uploads\/sites\/4\/2020\/04\/q453a.png?resize=479%2C122\" alt=\"x^n+y^n=z^n\" width=\"479\" height=\"122\" class=\"aligncenter size-full wp-image-1706\" srcset=\"https:\/\/i0.wp.com\/xmau.com\/ilpost\/wp-content\/uploads\/sites\/5\/2020\/04\/q453a.png?w=479&amp;ssl=1 479w, https:\/\/i0.wp.com\/xmau.com\/ilpost\/wp-content\/uploads\/sites\/5\/2020\/04\/q453a.png?resize=300%2C76&amp;ssl=1 300w\" sizes=\"auto, (max-width: 479px) 100vw, 479px\" \/><br \/>\n<!-- Fattorizzate la differenza. --><\/p>\n<p><b><big>4. Un numero irrazionale<\/big><\/b><br \/>\n\u00c8 vero che in genere non si pu\u00f2 risolvere un&#8217;equazione per radicali; per\u00f2 qualcosa si pu\u00f2 comunque dire. Per esempio, l&#8217;equazione <i>x<\/i><sup>5<\/sup>+<i>x<\/i>=10 ha una sola soluzione positiva che \u00e8 compresa tra 1,5 e 1,6. Dimostrate che questa soluzione non \u00e8 un numero intero.<!-- problema 9--><br \/>\n<img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"1707\" data-permalink=\"https:\/\/xmau.com\/ilpost\/2020\/04\/12\/problemini-per-pasqua-2020\/q454a\/\" data-orig-file=\"https:\/\/i0.wp.com\/xmau.com\/ilpost\/wp-content\/uploads\/sites\/5\/2020\/04\/q454a.png?fit=484%2C114&amp;ssl=1\" data-orig-size=\"484,114\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"q454a\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/xmau.com\/ilpost\/wp-content\/uploads\/sites\/5\/2020\/04\/q454a.png?fit=484%2C114&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/xmau.com\/wp\/ilpost\/wp-content\/uploads\/sites\/4\/2020\/04\/q454a.png?resize=484%2C114\" alt=\"x^5+x=10\" width=\"484\" height=\"114\" class=\"aligncenter size-full wp-image-1707\" srcset=\"https:\/\/i0.wp.com\/xmau.com\/ilpost\/wp-content\/uploads\/sites\/5\/2020\/04\/q454a.png?w=484&amp;ssl=1 484w, https:\/\/i0.wp.com\/xmau.com\/ilpost\/wp-content\/uploads\/sites\/5\/2020\/04\/q454a.png?resize=300%2C71&amp;ssl=1 300w\" sizes=\"auto, (max-width: 484px) 100vw, 484px\" \/><br \/>\n<!-- Una sola parola: Ruffini. --><\/p>\n<p><b><big>5. Distanziamento<\/big><\/b><br \/>\nImmaginate di avere un certo numero di punti nel piano, e che tutte distanze tra due di questi punti sono diverse tra loro. Collegate ora ciascun punto a quello pi\u00f9 vicino con un segmento. Il grafo che otterrete non \u00e8 necessariamente connesso; dimostrate per\u00f2 che non pu\u00f2 contenere un poligono chiuso oppure due archi che si incrociano. <!-- problema 12 --><br \/>\n<img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"1711\" data-permalink=\"https:\/\/xmau.com\/ilpost\/2020\/04\/12\/problemini-per-pasqua-2020\/q455a\/\" data-orig-file=\"https:\/\/i0.wp.com\/xmau.com\/ilpost\/wp-content\/uploads\/sites\/5\/2020\/04\/q455a.png?fit=340%2C240&amp;ssl=1\" data-orig-size=\"340,240\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"q455a\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/xmau.com\/ilpost\/wp-content\/uploads\/sites\/5\/2020\/04\/q455a.png?fit=340%2C240&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/xmau.com\/wp\/ilpost\/wp-content\/uploads\/sites\/4\/2020\/04\/q455a.png?resize=340%2C240\" alt=\"tanti punti\" width=\"340\" height=\"240\" class=\"aligncenter size-full wp-image-1711\" srcset=\"https:\/\/i0.wp.com\/xmau.com\/ilpost\/wp-content\/uploads\/sites\/5\/2020\/04\/q455a.png?w=340&amp;ssl=1 340w, https:\/\/i0.wp.com\/xmau.com\/ilpost\/wp-content\/uploads\/sites\/5\/2020\/04\/q455a.png?resize=300%2C212&amp;ssl=1 300w\" sizes=\"auto, (max-width: 340px) 100vw, 340px\" \/><br \/>\n<!-- Fate il giro del poligono, e costruite un parallelogramma. --><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Il libro da cui li ho tratti dice che sono &#8220;elementari&#8221;. Beh, insomma&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"activitypub_content_warning":"","activitypub_content_visibility":"","activitypub_max_image_attachments":4,"activitypub_interaction_policy_quote":"anyone","activitypub_status":"","footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[1],"tags":[129],"class_list":["post-1698","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-quizzini"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/phh2yP-ro","jetpack-related-posts":[{"id":2275,"url":"https:\/\/xmau.com\/ilpost\/2010\/06\/10\/ci-sono-infiniti-piu-infiniti\/","url_meta":{"origin":1698,"position":0},"title":"Ci sono infiniti &#8220;pi\u00f9 infiniti&#8221;!","author":".mau.","date":"10\/06\/2010","format":false,"excerpt":"Il metodo diagonale di Cantor mostra che ci sono diversi tipi di infiniti, e ne costruisce esplicitamente uno, se si ha una pazienza infinita. 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Fibonacci I numeri di Fibonacci li conoscete tutti: si parte da F1=F2=1 (e se volete, F0=0) e da l\u00ec ogni numero \u00e8 la somma dei\u2026","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":2422,"url":"https:\/\/xmau.com\/ilpost\/2011\/07\/12\/6174-196-e-altri-numeri\/","url_meta":{"origin":1698,"position":4},"title":"6174, 196 e altri numeri","author":".mau.","date":"12\/07\/2011","format":false,"excerpt":"Alcuni numeri sono pi\u00f9 interessanti di altri, almeno per chi ama cercare le loro propriet\u00e0 strane.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":2662,"url":"https:\/\/xmau.com\/ilpost\/2015\/12\/31\/risposte-ai-problemini-per-natale-2015\/","url_meta":{"origin":1698,"position":5},"title":"Risposte ai problemini per Natale 2015","author":".mau.","date":"31\/12\/2015","format":false,"excerpt":"Ricordate i problemi di venerd\u00ec scorso? 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Fibonacci Per un qualunque intero m, i valori della successione di Fibonacci modulo m prima o poi si devono ripetere: banalmente, ci sono solo m2 possibili coppie\u2026","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"_links":{"self":[{"href":"https:\/\/xmau.com\/ilpost\/wp-json\/wp\/v2\/posts\/1698","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/xmau.com\/ilpost\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/xmau.com\/ilpost\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/xmau.com\/ilpost\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/xmau.com\/ilpost\/wp-json\/wp\/v2\/comments?post=1698"}],"version-history":[{"count":8,"href":"https:\/\/xmau.com\/ilpost\/wp-json\/wp\/v2\/posts\/1698\/revisions"}],"predecessor-version":[{"id":1729,"href":"https:\/\/xmau.com\/ilpost\/wp-json\/wp\/v2\/posts\/1698\/revisions\/1729"}],"wp:attachment":[{"href":"https:\/\/xmau.com\/ilpost\/wp-json\/wp\/v2\/media?parent=1698"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/xmau.com\/ilpost\/wp-json\/wp\/v2\/categories?post=1698"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/xmau.com\/ilpost\/wp-json\/wp\/v2\/tags?post=1698"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}