C\u00e2u 1:<\/b>\u00a0Gi\u1ea3i b\u1ea5t ph\u01b0\u01a1ng tr\u00ecnh<\/p>\n
<\/p>\n
A. x < -6 ho\u1eb7c x > 2 \u00a0\u00a0\u00a0C. x < -2 ho\u1eb7c x > 6<\/p>\n
B. -6 < x < 2 \u00a0\u00a0\u00a0D. -2 < x < 6<\/p>\n
C\u00e2u 2:<\/b>\u00a0Gi\u1ea3i b\u1ea5t ph\u01b0\u01a1ng tr\u00ecnh 2.4x + 1<\/sup>\u00a0< 162x<\/sup><\/p>\n A. x > 1 \u00a0\u00a0\u00a0B. x < 1 \u00a0\u00a0\u00a0C. x > 1\/2 \u00a0\u00a0\u00a0D. x < 1\/2<\/p>\n C\u00e2u 3:<\/b>\u00a0Gi\u1ea3i b\u1ea5t ph\u01b0\u01a1ng tr\u00ecnh 2x<\/sup>.3x<\/sup>\u00a0\u2264 36<\/p>\n A. x \u2264 2 \u00a0\u00a0\u00a0B. x \u2264 3 \u00a0\u00a0\u00a0C. x \u2264 6 \u00a0\u00a0\u00a0D. x \u2264 4<\/p>\n C\u00e2u 4:<\/b>\u00a0Gi\u1ea3i b\u1ea5t ph\u01b0\u01a1ng tr\u00ecnh 7.3x + 1<\/sup>\u00a0+ 5x + 3<\/sup>\u00a0\u2264 3x + 4<\/sup>\u00a0+ 5x + 2<\/sup><\/p>\n A. x \u2264 -1\u00a0\u00a0\u00a0B. x \u2265 -1 \u00a0\u00a0\u00a0C. x \u2264 0 \u00a0\u00a0\u00a0D. x \u2265 0<\/p>\n C\u00e2u 5:<\/b>\u00a0T\u00ecm t\u1eadp nghi\u1ec7m c\u1ee7a b\u1ea5t ph\u01b0\u01a1ng tr\u00ecnh<\/p>\n <\/p>\n A. (-1; 1)\u00a0\u00a0\u00a0C. (-\u221e; -1) \u222a (-1; 1)<\/p>\n B. (-1; -1) \u222a (1; +\u221e) \u00a0\u00a0\u00a0D. (-\u221e; -2) \u222a (1; +\u221e)<\/p>\n C\u00e2u 6:<\/b>\u00a0Gi\u1ea3i b\u1ea5t ph\u01b0\u01a1ng tr\u00ecnh 54x – 6<\/sup>\u00a0> 33x – 4<\/sup><\/p>\n <\/p>\n C\u00e2u 7:<\/b>\u00a0Trong c\u00e1c s\u1ed1 d\u01b0\u01a1ng x th\u1ecfa m\u00e3n logx \u2265 log2 + (1\/2)logx<\/p>\n A. S\u1ed1 c\u00f3 gi\u00e1 tr\u1ecb l\u1edbn nh\u1ea5t l\u00e0 1 \u00a0\u00a0\u00a0C. s\u1ed1 c\u00f3 gi\u00e1 tr\u1ecb l\u1edbn nh\u1ea5t l\u00e0 4<\/p>\n B. S\u1ed1 c\u00f3 gi\u00e1 tr\u1ecb nh\u1ecf nh\u1ea5t l\u00e0 1 \u00a0\u00a0\u00a0D. s\u1ed1 c\u00f3 gi\u00e1 tr\u1ecb nh\u1ecf nh\u1ea5t l\u00e0 4<\/p>\n H\u01b0\u1edbng d\u1eabn gi\u1ea3i v\u00e0 \u0110\u00e1p \u00e1n<\/b><\/p>\n C\u00e2u 1:<\/b><\/p>\n (1\/3)x2\u00a0– 4x + 12<\/sup>\u00a0> 1 <=> x2<\/sup>\u00a0– 2x – 12 < 0 (v\u00ec (1\/3) < 1) <=> -2 < x < 6<\/p>\n C\u00e2u 2:<\/b><\/p>\n 2.4x + 1<\/sup>\u00a0< 162x<\/sup>\u00a0<=> 2.22(x + 1)<\/sup>\u00a0< (24<\/sup>)2x<\/sup>\u00a0<=>22x + 3<\/sup>\u00a0< 28x<\/sup>\u00a0<=> 2x + 3 < 8x <=> x > 1\/2<\/p>\n C\u00e2u 3:<\/b><\/p>\n 2x<\/sup>.3x<\/sup>\u00a0\u2264 36 <=> 6x<\/sup>\u00a0\u2264 62<\/sup>\u00a0<=> x \u2264 2<\/p>\n C\u00e2u 4:<\/b><\/p>\n B\u1ea5t ph\u01b0\u01a1ng tr\u00ecnh <=> 7.3x + 1<\/sup>\u00a0+ 25.5x + 1<\/sup>\u00a0\u2264 27.3x + 1<\/sup>\u00a0+ 5.5x + 1<\/sup>\u00a0<=> 20.5x + 1<\/sup>\u00a0\u2264 20.3x + 1<\/sup><\/p>\n <=> (5\/3)x + 1<\/sup>\u00a0< 1 <=> x + 1 \u2264 0( v\u00ec (5\/3) > 1) <=> x \u2264 -1<\/p>\n C\u00e2u 5:<\/b><\/p>\n Nh\u1eadn th\u1ea5y (\u221a5 + 2)(\u221a5 – 2) = 1 hay \u221a5 – 2 = (\u221a5 + 2)-1<\/sup>\u00a0n\u00ean b\u1ea5t ph\u01b0\u01a1ng tr\u00ecnh \u0111\u00e3 cho t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi<\/p>\n <\/p>\n T\u1eadp nghi\u1ec7m l\u00e0 (-2; -1) \u222a (1; +\u221e)<\/p>\n C\u00e2u 6:<\/b><\/p>\n L\u1ea5y l\u00f4garit theo c\u01a1 s\u1ed1 5 hai v\u1ebf c\u1ee7a b\u1ea5t ph\u01b0\u01a1ng tr\u00ecnh, ta \u0111\u01b0\u1ee3c :<\/p>\n 4x – 6 > (3x – 4)log5<\/sub>3 <=> (4 – 3log5<\/sub>3)x > 6 – 4log5<\/sub>3<\/p>\n <\/p>\n C\u00e2u 7:<\/b><\/p>\n <\/p>\n <=> logx \u2265 log4 <=> x \u2265 4<\/p>\n S\u1ed1 x nh\u1ecf nh\u1ea5t l\u00e0 4<\/p>\n","protected":false},"excerpt":{"rendered":" C\u00e2u 1:\u00a0Gi\u1ea3i b\u1ea5t ph\u01b0\u01a1ng tr\u00ecnh A. x < -6 ho\u1eb7c x > 2 \u00a0\u00a0\u00a0C. x < -2 ho\u1eb7c x > 6 B. -6 < x < 2 \u00a0\u00a0\u00a0D. -2 < x < 6 C\u00e2u 2:\u00a0Gi\u1ea3i b\u1ea5t ph\u01b0\u01a1ng tr\u00ecnh 2.4x + 1\u00a0< 162x A. x > 1 \u00a0\u00a0\u00a0B. x < 1 \u00a0\u00a0\u00a0C. x > 1\/2 \u00a0\u00a0\u00a0D. […]<\/p>\n","protected":false},"author":3,"featured_media":27327,"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\n\n
\n 1-D<\/td>\n 2-C<\/td>\n 3-A<\/td>\n 4-A<\/td>\n 5-B<\/td>\n 6-C<\/td>\n 7-D<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n