题目内容
(1)已知lg2=a,lg3=b,试用a,b表示 log215;
(2)求值:(2
)
+(lg5)0+(
)-
.
(2)求值:(2
| 7 |
| 9 |
| 1 |
| 2 |
| 27 |
| 64 |
| 1 |
| 3 |
(1)log215=
=
=
.
(2)原式=[(
)2]
+1+[(
)-3]-
=
+1+
=4.
| lg3+lg5 |
| lg2 |
| lg3+1-lg2 |
| lg2 |
| b+1-a |
| a |
(2)原式=[(
| 5 |
| 3 |
| 1 |
| 2 |
| 4 |
| 3 |
| 1 |
| 3 |
| 5 |
| 3 |
| 4 |
| 3 |
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