Page 26 - CHƯƠNG II: GIẢI TÍCH 12-12a2

Trường THPT Châu Phú Chương II: Mũ – Lôgarit INOXHTT
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1 2x x− 1
2
Câu 191: Cho biểu thức A = − x− + 3. 2 − 4 2 . Tìm x biết log A =
2 1 9
2 log 9
2 log 9
. A x = + 2 . B x = + 2 . C x = − 2 . D x = − 2
1 log 9
1 log 9
. A x = 2 . B x = 1 C .x  2 D .x  1
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Câu 192: Cho f(x) = ( x + ) 1 . Đạo hàm f’(1) bằng:
4
ln
A. 1 B. 2 C. 3 D. 4

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Câu 193: Tìm x nguyên để A là ước của 9;
. A x = 2 . B x = 1 C .x = 3 D .x =
0
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1 2x x− 1
Câu 194: Cho biểu thức A = − x− + 3. 2 − 4 2 . Biết rằng x nguyên dương và A là ước của 18. Khi đó giá
2 1
trị của x + 2 3x− 2 là:
A .6 B .7 C .8 D .9
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1 2x x− 1
Câu 195: Cho biểu thức A = − x− + 3. 2 − 4 2 . Nếu đặt 2 = x ( t t  0) . Thì A trở thành
2 1
9 9 2 2
. A − t . B t . C − t . D t
2 2 9 9
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x
x
Câu 196: Cho f(x) = 2 .3 . Đạo hàm f’(0) bằng:
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