题目内容
化简求值
(1)
+
+(0.25)
+(
)0-2-1
(2) lg14-2lg
+lg7-lg18
(1)
6
|
| 3 | 3
| ||
| 1 |
| 2 |
| 5 | π |
(2) lg14-2lg
| 7 |
| 3 |
(1)原式=(
)
+(
)
+(0.0625)
+1-
=5(6分)
(2)原式=lg(2×7)-2(lg7-lg3)+lg7-lg(32×2)
=lg2+lg7-2lg7+2lg3+lg7-2lg3-lg2=0(6分)
| 25 |
| 4 |
| 1 |
| 2 |
| 27 |
| 8 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 2 |
(2)原式=lg(2×7)-2(lg7-lg3)+lg7-lg(32×2)
=lg2+lg7-2lg7+2lg3+lg7-2lg3-lg2=0(6分)
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