Page 19 - CHƯƠNG II: GIẢI TÍCH 12-12a2
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Trường THPT Châu Phú Chương II: Mũ – Lôgarit INOXHTT
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Câu 149: log 8.log 81 bằng:
3 4
A. 8 B. 9 C. 7 D. 12
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Câu 150: Phương trình: 3 + x 4 = x 5 có nghiệm là:
x
A. 1 B. 2 C. 3 D. 4
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Câu 151: log 3.log 36 bằng:
6 3
A. 4 B. 3 C. 2 D. 1
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x
=
Câu 152: Cho phương trình 4 − 3.2 + 2 0. Nếu đặt t = 2 với t > 0 thì phương trình tương đương với
x
x
phương trình nào:
2
2
2
2
A. t +3t -2 = 0 B. t -3t +2 = 0 C. t + 3t +2 = 0 D. t -3t - 2 = 0
C©u 153: log 8.log 81 b»ng:
3 4
A. 8 B. 9 C. 7 D. 12
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Câu 154: Hàm số y = log 4x x 2 ) có tập xác định là:
5
A. (2; 6) B. (0; 4) C. (0; +∞) D. R
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Câu 155: Hàm số nào dưới đây đồng biến trên tập xác định của nó?
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