B\u00e0i 9 (trang 78 sgk Gi\u1ea3i T\u00edch 12 n\u00e2ng cao):<\/b>\u00a0<\/span><\/p>\nT\u1eeb t\u00ednh ch\u1ea5t c\u1ee7a l\u0169y th\u1eeba v\u1edbi s\u1ed1 m\u0169 nguy\u00ean d\u01b0\u01a1ng, ch\u1ee9ng minh :<\/p>\n
![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/03\/1-464.png\")
<\/p>\n
(a \u2265 0;b \u2265 0;n nguy\u00ean d\u01b0\u01a1ng)<\/p>\n
L\u1eddi gi\u1ea3i:<\/b><\/p>\n
![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/03\/2-307.png\")
<\/p>\n
\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t c\u1ee7a l\u0169y th\u1eeba v\u1edbi s\u1ed1 m\u0169 nguy\u00ean d\u01b0\u01a1ng, ta c\u00f3:<\/p>\n
ab=(xy)n<\/sup><\/p>\n![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/03\/3-156.png\")
<\/p>\n
B\u00e0i 10 (trang 78 sgk Gi\u1ea3i T\u00edch 12 n\u00e2ng cao):<\/b>\u00a0<\/span><\/p>\nCh\u1ee9ng minh<\/p>\n
![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/03\/1-465.png\")
<\/p>\n
L\u1eddi gi\u1ea3i:<\/b><\/p>\n
![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/03\/2-308.png\")
<\/p>\n
B\u00e0i 11 (trang 78 sgk Gi\u1ea3i T\u00edch 12 n\u00e2ng cao):<\/b><\/span><\/p>\nSo s\u00e1nh c\u00e1c s\u1ed1:<\/p>\n
![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/03\/1-466.png\")
<\/p>\n
L\u1eddi gi\u1ea3i:<\/b><\/p>\n
![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/03\/2-309.png\")
<\/p>\n
c) (36<\/sup>\u00a0)100<\/sup>=729100<\/sup>\u00a0v\u00e0 (54<\/sup>\u00a0)100<\/sup>=(625)100<\/sup>=> 3600<\/sup>\u00a0> 5400<\/sup><\/p>\n![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/03\/3-157.png\")
<\/p>\n
d) 730<\/sup>=(73<\/sup>\u00a0)10<\/sup>=34310<\/sup>;440<\/sup>=(44<\/sup>\u00a0)10<\/sup>=25610<\/sup><\/p>\nV\u00ec 343 > 256 > 0 n\u00ean 34310<\/sup>\u00a0> 25610<\/sup>=> 730<\/sup>\u00a0> 440<\/sup><\/p>\n","protected":false},"excerpt":{"rendered":"B\u00e0i 8 (trang 78 sgk Gi\u1ea3i T\u00edch 12 n\u00e2ng cao):\u00a0\u0110\u01a1n gi\u1ea3i bi\u1ec3u th\u1ee9c L\u1eddi gi\u1ea3i: B\u00e0i 9 (trang 78 sgk Gi\u1ea3i T\u00edch 12 n\u00e2ng cao):\u00a0 T\u1eeb t\u00ednh ch\u1ea5t c\u1ee7a l\u0169y th\u1eeba v\u1edbi s\u1ed1 m\u0169 nguy\u00ean d\u01b0\u01a1ng, ch\u1ee9ng minh : (a \u2265 0;b \u2265 0;n nguy\u00ean d\u01b0\u01a1ng) L\u1eddi gi\u1ea3i: \u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t c\u1ee7a l\u0169y th\u1eeba […]<\/p>\n","protected":false},"author":3,"featured_media":23552,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[1302],"tags":[1392,1393],"yoast_head":"\n
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![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/03\/1-463.png\")
<\/p>\n![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/03\/2-306.png\")
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