{"id":7529,"date":"2021-11-20T13:58:51","date_gmt":"2021-11-20T06:58:51","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=7529"},"modified":"2021-11-20T15:08:49","modified_gmt":"2021-11-20T08:08:49","slug":"cau-be-karl-gauss-lam-the-nao-de-tinh-tong-day-so-1-2-3-100","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/cau-be-karl-gauss-lam-the-nao-de-tinh-tong-day-so-1-2-3-100\/","title":{"rendered":"C\u1eadu b\u00e9 Karl (Gauss) l\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 t\u00ednh t\u1ed5ng d\u00e3y s\u1ed1 1 + 2+ 3 +\u2026+100?"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Truy\u1ec7n k\u1ec3 r\u1eb1ng nh\u00e0 to\u00e1n h\u1ecdc \u0110\u1ee9c Karl-Frederich. Gauss ngay t\u1eeb l\u00fac c\u00f2n r\u1ea5t b\u00e9 \u0111\u00e3 bi\u1ec3u hi\u1ec7n kh\u1ea3 n\u0103ng t\u00ednh to\u00e1n phi th\u01b0\u1eddng. Khi l\u00e0 <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">h\u1ecdc sinh<\/a> ti\u1ec3u h\u1ecdc, v\u00e0o n\u0103m 10 tu\u1ed5i, th\u1ea7y gi\u00e1o ra m\u1ed9t \u0111\u1ec1 to\u00e1n 1 + 2 + 3 +\u2026+ 100 b\u1eb1ng bao nhi\u00eau? \u0110\u1ec3 xem ai t\u00ednh nhanh h\u01a1n. Khi th\u1ea7y v\u1eeba \u0111\u1ecdc xong \u0111\u1ec1 to\u00e1n, c\u1eadu b\u00e9 Gauss \u0111\u00e3 tr\u1ea3 l\u1eddi ngay t\u1ed5ng c\u1ee7a 100 s\u1ed1 \u0111\u00f3 l\u00e0 5050.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e1c b\u1ea1n h\u1ecdc nghe c\u00e2u tr\u1ea3 l\u1eddi c\u1ee7a Karl v\u1eeba kinh ng\u1ea1c v\u1eeba t\u1ecf \u00fd nghi ng\u1edd. Ch\u1ec9 th\u1ea7y gi\u00e1o m\u1edbi bi\u1ebft ch\u1eafc ch\u1eafn \u0111\u00f3 l\u00e0 \u0111\u00e1p s\u1ed1 \u0111\u00fang. Th\u1ebf c\u1eadu b\u00e9 Karl \u0111\u00e3 t\u00ednh nh\u01b0 th\u1ebf n\u00e0o?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u1eadu b\u00e9 Karle cho bi\u1ebft 100 con s\u1ed1 t\u1eeb 1 \u0111\u1ebfn 100 c\u00f3 \u0111\u1eb7c t\u00ednh l\u00e0 t\u1ed5ng con s\u1ed1 \u0111\u1ea7u v\u00e0 con s\u1ed1 cu\u1ed1i l\u00e0 101, s\u1ed1 th\u1ee9 hai v\u00e0 s\u1ed1 \u00e1p cu\u1ed1i c\u00f9ng c\u0169ng c\u00f3 t\u1ed5ng b\u1eb1ng 101, c\u00f3 t\u1ea5t c\u1ea3 50 \u0111\u00f4i s\u1ed1 nh\u01b0 v\u1eady t\u1eeb s\u1ed1 1 \u0111\u1ebfn s\u1ed1 100. T\u1ed5ng c\u1ee7a 50 \u0111\u00f4i s\u1ed1 n\u00e0y s\u1ebd l\u00e0 101 x 50 = 5050<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ta s\u1ebd xem c\u1ee5 th\u1ec3 50 \u0111\u00f4i s\u1ed1 nh\u01b0 sau:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ng\u01b0\u1eddi ta c\u00f2n k\u1ec3 nhi\u1ec1u chuy\u1ec7n v\u1ec1 t\u00e0i quan s\u00e1t tinh t\u1ebf c\u1ee7a Gauss. V\u00ed nh\u01b0 c\u00f3 l\u1ea7n khi c\u1eadu b\u00e9 Karl \u0111\u1ee9ng g\u1ea7n cha v\u00e0 xem cha t\u00ednh s\u1ed5 thu nh\u1eadp. Khi cha \u00f4ng t\u00ednh xong, \u00f4ng nh\u00ecn cha v\u00e0 n\u00f3i \u201cCha t\u00ednh sai r\u1ed3i\u2026K\u1ebft qu\u1ea3 ph\u1ea3i l\u00e0\u2026\u201d Cha c\u1eadu l\u1ea5y l\u00e0m kinh ng\u1ea1c v\u00e0 th\u1ea5y con m\u00ecnh \u0111\u00e3 n\u00f3i \u0111\u00fang.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L\u00fac \u0111\u00f3 c\u1eadu b\u00e9 Carl \u0111\u00e3 h\u1ecdc to\u00e1n ch\u01b0a? Ch\u01b0a, v\u00ec l\u00fac \u0111\u00f3 c\u1eadu b\u00e9 Carl m\u1edbi ba tu\u1ed5i ch\u01b0a \u0111\u1ea7y 3 tu\u1ed5i! Do c\u1eadu y\u00eau th\u00edch \u201ccon s\u1ed1\u201d v\u00e0 t\u00ednh to\u00e1n ngay t\u1eeb l\u00fac c\u00f2n nh\u1ecf n\u00ean \u0111\u00e3 h\u1ecdc \u0111\u01b0\u1ee3c c\u00e1ch t\u00ednh to\u00e1n khi m\u00e0 ng\u01b0\u1eddi l\u1edbn c\u00f2n ch\u01b0a ch\u00fa \u00fd.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">V\u1ec1 sau Gauss \u0111\u00e3 chuy\u00ean t\u00e2m h\u1ecdc to\u00e1n, \u0111\u1ebfn \u0111\u1ed9 tu\u1ed5i thanh ni\u00ean \u00f4ng \u0111\u00e3 tr\u1edf th\u00e0nh nh\u00e0 to\u00e1n h\u1ecdc n\u1ed5i ti\u1ebfng. \u00d4ng quan t\u00e2m nghi\u00ean c\u1ee9u v\u00e0 h\u1ee9ng th\u00fa v\u1edbi nhi\u1ec1u l\u0129nh v\u1ef1c: ng\u00f4n ng\u1eef c\u1ed5 \u0111\u1ea1i, thi\u00ean v\u0103n, v\u1eadt l\u00ed \u00f4ng \u0111\u1ec1u quan t\u00e2m nghi\u00ean c\u1ee9u, \u0111\u00e3 c\u00f3 nhi\u1ec1u ph\u00e1t hi\u1ec7n v\u00e0 ph\u00e1t minh. \u00d4ng l\u00e0 nh\u00e0 thi\u00ean v\u0103n h\u1ecdc, nh\u00e0 v\u1eadt l\u00ed l\u1ed7i l\u1ea1c.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Gauss c\u0169ng nh\u01b0 nhi\u1ec1u nh\u00e0 khoa h\u1ecdc kh\u00e1c, ngay t\u1eeb nh\u1ecf \u0111\u00e3 c\u00f3 \u00f3c quan s\u00e1t tinh t\u1ebf, ch\u00fa \u00fd \u0111\u1ebfn m\u1ecdi hi\u1ec7n t\u01b0\u1ee3ng x\u1ea3y ra xung quanh, t\u1eeb \u0111\u00f3 \u0111\u00e3 khai s\u00e1ng v\u00e0 c\u00f3 c\u00e1c c\u1ed1ng hi\u1ebfn v\u0129 \u0111\u1ea1i.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">T\u1eeb kho\u00e1: Gauss.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"<p>Truy\u1ec7n k\u1ec3 r\u1eb1ng nh\u00e0 to\u00e1n h\u1ecdc \u0110\u1ee9c Karl-Frederich. Gauss ngay t\u1eeb l\u00fac c\u00f2n r\u1ea5t b\u00e9 \u0111\u00e3 bi\u1ec3u hi\u1ec7n kh\u1ea3 n\u0103ng t\u00ednh to\u00e1n phi th\u01b0\u1eddng. Khi l\u00e0 h\u1ecdc sinh ti\u1ec3u h\u1ecdc, v\u00e0o n\u0103m 10 tu\u1ed5i, th\u1ea7y gi\u00e1o ra m\u1ed9t \u0111\u1ec1 to\u00e1n 1 + 2 + 3 +\u2026+ 100 b\u1eb1ng bao nhi\u00eau? \u0110\u1ec3 xem ai t\u00ednh nhanh [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_disable_autopaging":false},"categories":[15,9],"tags":[],"class_list":["post-7529","post","type-post","status-publish","format-standard","hentry","category-hoi-dap-khoa-hoc","category-toan-hoc"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/7529","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/comments?post=7529"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/7529\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=7529"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=7529"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=7529"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}