题目内容
计算:(1)2log2
+(
)-
+lg20-lg2-(log32)•(log23)
(2)16
-(
)-
-lg
-sin30°+(
-1)lg1.
| 1 |
| 4 |
| 16 |
| 9 |
| 1 |
| 2 |
(2)16
| 1 |
| 4 |
| 1 |
| 27 |
| 1 |
| 3 |
| 1000 |
| 2 |
(1)原式=
+[(
)2]-
+lg
-
•
=
+(
)-1+lg10-1=
+
+1-1=1…(6分)
(2)原式═(24)
-[(
)3]
-lg(103)
-sin30°+(
-1)0
=2-(
)-1-lg10
-
+1=2-3-
-
+1=-2…(12分)
| 1 |
| 4 |
| 4 |
| 3 |
| 1 |
| 2 |
| 20 |
| 2 |
| lg2 |
| lg3 |
| lg3 |
| lg2 |
=
| 1 |
| 4 |
| 4 |
| 3 |
| 1 |
| 4 |
| 3 |
| 4 |
(2)原式═(24)
| 1 |
| 4 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 2 |
| 2 |
=2-(
| 1 |
| 3 |
| 3 |
| 2 |
| 1 |
| 2 |
| 3 |
| 2 |
| 1 |
| 2 |
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