{"id":911,"date":"2022-05-27T12:57:02","date_gmt":"2022-05-27T05:57:02","guid":{"rendered":"http:\/\/azfree.co\/?p=911"},"modified":"2022-08-03T15:02:41","modified_gmt":"2022-08-03T08:02:41","slug":"tinh-nhanh-binh-phuong-so-co-2-chu-so","status":"publish","type":"post","link":"https:\/\/123.guong.com.vn\/?p=911","title":{"rendered":"T\u00ednh nhanh b\u00ecnh ph\u01b0\u01a1ng s\u1ed1 c\u00f3 2 ch\u1eef s\u1ed1"},"content":{"rendered":"\n<p>B\u00ecnh ph\u01b0\u01a1ng s\u1ed1 c\u00f3 2 ch\u1eef s\u1ed1: 10<sup>2<\/sup>, 11<sup>2<\/sup>, 12<sup>2<\/sup>,&#8230; 99<sup>2<\/sup><\/p>\n<p>S\u1ed1 c\u00f3 2 ch\u1eef s\u1ed1 c\u00f3 d\u1ea1ng (10a + b)<sup>2<\/sup> <em>trong \u0111\u00f3 a, b l\u00e0 c\u00e1c s\u1ed1 t\u1ef1 nhi\u00ean t\u1eeb 0, 1, 2,&#8230;, 9<\/em><\/p>\n<p>\u00c1p d\u1ee5ng h\u1eb1ng \u0111\u1eb3ng th\u1ee9c \u0111\u1ec3 t\u00ednh nhanh: (10a + b)<sup>2<\/sup> = (10a)<sup>2<\/sup> + 2.10a.b + b<sup>2<\/sup> = 100a<sup>2<\/sup> + b<sup>2<\/sup> + 10a.b.2<\/p>\n<p>Ta l\u01b0\u1ee3c b\u1edbt s\u1ed1 100, 10 \u0111i cho d\u1ec5 t\u00ednh, ch\u1ec9 c\u1ea7n t\u00ednh a<sup>2<\/sup>, b<sup>2<\/sup>, a.b.2<\/p>\n<p>V\u00ed d\u1ee5: T\u00ednh nhanh 67<sup>2<\/sup> = ?<\/p>\n<p>L\u1ea5y 6<sup>2<\/sup> gh\u00e9p v\u1edbi 7<sup>2<\/sup> r\u1ed3i c\u1ed9ng 6.7.2 nh\u01b0 h\u00ecnh d\u01b0\u1edbi \u0111\u00e2y.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-916\" src=\"http:\/\/azfree.co\/wp-content\/uploads\/2022\/05\/tinh-nhanh-binh-phuong-so-co-2-chu-so.jpg\" alt=\"T\u00ednh nhanh b\u00ecnh ph\u01b0\u01a1ng s\u1ed1 c\u00f3 2 ch\u1eef s\u1ed1\" width=\"500\" height=\"400\" srcset=\"https:\/\/123.guong.com.vn\/wp-content\/uploads\/2022\/05\/tinh-nhanh-binh-phuong-so-co-2-chu-so.jpg 500w, https:\/\/123.guong.com.vn\/wp-content\/uploads\/2022\/05\/tinh-nhanh-binh-phuong-so-co-2-chu-so-300x240.jpg 300w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>M\u1ed9t s\u1ed1 v\u00ed d\u1ee5:<\/p>\n<p>16<sup>2<\/sup> = ?, l\u1ea5y 1<sup>2<\/sup> gh\u00e9p v\u1edbi 6<sup>2<\/sup> \u0111\u01b0\u1ee3c 0136 c\u1ed9ng v\u1edbi 1 x 6 x 2 = 12 <em>(s\u1ed1 12 \u0111\u1eb7t nh\u01b0 s\u1ed1 84 \u1edf h\u00ecnh tr\u00ean)<\/em>, k\u1ebft qu\u1ea3: 256<\/p>\n<p>24<sup>2<\/sup> = ?, l\u1ea5y 2<sup>2<\/sup> gh\u00e9p v\u1edbi 4<sup>2<\/sup> \u0111\u01b0\u1ee3c 0416 c\u1ed9ng v\u1edbi 2 x 4 x 2 = 16 <em>(s\u1ed1 16 \u0111\u1eb7t nh\u01b0 s\u1ed1 84 \u1edf h\u00ecnh tr\u00ean)<\/em>, k\u1ebft qu\u1ea3: 576<\/p>\n<p>33<sup>2<\/sup> = ?, l\u1ea5y 3<sup>2<\/sup> gh\u00e9p v\u1edbi 3<sup>2<\/sup> \u0111\u01b0\u1ee3c 0909 c\u1ed9ng v\u1edbi 3 x 3 x 2 = 18 <em>(s\u1ed1 18 \u0111\u1eb7t nh\u01b0 s\u1ed1 84 \u1edf h\u00ecnh tr\u00ean)<\/em>, k\u1ebft qu\u1ea3: 1089<\/p>\n","protected":false},"excerpt":{"rendered":"<p>T\u00ednh nhanh b\u00ecnh ph\u01b0\u01a1ng s\u1ed1 c\u00f3 2 ch\u1eef s\u1ed1.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"pgc_sgb_lightbox_settings":"","footnotes":""},"categories":[113],"tags":[129],"series":[],"blocksy_meta":{"styles_descriptor":{"styles":{"desktop":"","tablet":"","mobile":""},"google_fonts":[],"version":6}},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v18.1 (Yoast SEO v22.4) - 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