题目内容
(1)计算:0.064-
-(-
)0+16
+0.25
;
(2)已知a=log32,3b=5,用a,b表示log3
.
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| 8 |
| 3 |
| 4 |
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| 2 |
(2)已知a=log32,3b=5,用a,b表示log3
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(1)原式=((0.4)3)-
-1+23+((
)2)
,
=0.4-1 -1+8+
=
+7+
=10.
(2)∵3b =5,∴b=log35,
∴log3
=
log3(2×3×5)=
(log32+1+log35)=
(1+a+b).
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=0.4-1 -1+8+
| 1 |
| 2 |
| 5 |
| 2 |
| 1 |
| 2 |
(2)∵3b =5,∴b=log35,
∴log3
| 30 |
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