1. \u0110\u1ecbnh ngh\u0129a c\u1ee7a logarit: \u03b1 = log_{a<\/sub>b <=> a^{\u03b1<\/sup>\u00a0= b (0 < a \u2260 1, b > 0) .<\/b><\/p>\n}}

2. \u0110i\u1ec1u ki\u1ec7n c\u00f3 ngh\u0129a c\u1ee7a bi\u1ec3u th\u1ee9c logarit: Bi\u1ec3u th\u1ee9c log_{a<\/sub>b c\u00f3 ngh\u0129a l\u00e0 khi v\u00e0 ch\u1ec9 khi 0 < a \u2260 1, b > 0 ;<\/b><\/p>\n}

D\u01b0\u1edbi \u0111\u00e2y , ta lu\u00f4n gi\u1ea3 thi\u1ebft 0 < a \u2260 1, b, c < 0, \u03b1 \u2260 R, n \u2260 N*<\/p>\n

3. M\u1ed9t s\u1ed1 \u0111\u1ed3ng nh\u1ea5t th\u1ee9c \u0111\u1eb7c bi\u1ec7t:<\/b><\/p>\n

+) log_{a<\/sub>1 = 0; +) a^{loga<\/sub>b<\/sup>\u00a0= b; +) loga<\/sub>a = 1<\/p>\n}}

4. L\u00f4garit c\u1ee7a t\u00edch v\u00e0 th\u01b0\u01a1ng:<\/b><\/p>\n

+) log_{a<\/sub>(bc) = loga<\/sub>b + loga<\/sub>c;<\/p>\n}

+) log_{a<\/sub>(b\/c) = loga<\/sub>b – loga<\/sub>c<\/p>\n}

5. L\u00f4garit c\u1ee7a l\u0169y th\u1eeba<\/b><\/p>\n

+) log_{a<\/sub>b^{\u03b1<\/sup>\u00a0= \u03b1loga<\/sub>b<\/p>\n}}

+) log(a^{\u03b1<\/sup>)b = (1\/\u03b1)log_{a<\/sub>b (\u03b1 \u2260 0)<\/p>\n}}

6. \u0110\u1ed5i c\u01a1 s\u1ed1<\/b><\/p>\n

<\/p>\n

7. K\u00ed hi\u1ec7u c\u1ee7a l\u00f4garit th\u1eadp ph\u00e2n v\u00e0 l\u00f4garit t\u1ef1 nhi\u00ean<\/b><\/p>\n

+) logb = log_{10<\/sub>b;<\/p>\n}

+) lnb = log_{e<\/sub>b<\/p>\n","protected":false},"excerpt":{"rendered":"}

1. \u0110\u1ecbnh ngh\u0129a c\u1ee7a logarit: \u03b1 = logab <=> a\u03b1\u00a0= b (0 < a \u2260 1, b > 0) . 2. \u0110i\u1ec1u ki\u1ec7n c\u00f3 ngh\u0129a c\u1ee7a bi\u1ec3u th\u1ee9c logarit: Bi\u1ec3u th\u1ee9c logab c\u00f3 ngh\u0129a l\u00e0 khi v\u00e0 ch\u1ec9 khi 0 < a \u2260 1, b > 0 ; D\u01b0\u1edbi \u0111\u00e2y , ta lu\u00f4n gi\u1ea3 thi\u1ebft […]<\/p>\n","protected":false},"author":3,"featured_media":27544,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[157],"tags":[1447,1446],"yoast_head":"\n