题目内容
计算:
(1)2 log2
+(
) -
+lg20-lg2-(log32)•(log23)
(2)(
×
)6+(
)
-4(
) -
-
×80.25-(-2005)0.
(1)2 log2
| 1 |
| 4 |
| 16 |
| 9 |
| 1 |
| 2 |
(2)(
| 3 | 2 |
| 3 |
2
|
| 4 |
| 3 |
| 16 |
| 49 |
| 1 |
| 2 |
| 4 | 2 |
(1)2 log2
+(
) -
+lg20-lg2-(log32)•(log23)
=
+[(
)2]-
+lg2+1-lg2-
•
=
+
+1-1=1;
(2)(
×
)6+(
)
-4(
) -
-
×80.25-(-2005)0
=2
×3
+(
)
-4[(
)2]-
-2
×2
-1
=4×3
+2-4×
-2-1
=12
-8.
| 1 |
| 4 |
| 16 |
| 9 |
| 1 |
| 2 |
=
| 1 |
| 4 |
| 4 |
| 3 |
| 1 |
| 2 |
| lg2 |
| lg3 |
| lg3 |
| lg2 |
=
| 1 |
| 4 |
| 3 |
| 4 |
(2)(
| 3 | 2 |
| 3 |
2
|
| 4 |
| 3 |
| 16 |
| 49 |
| 1 |
| 2 |
| 4 | 2 |
=2
| 6 |
| 3 |
| 3 |
| 2 |
2
|
| 4 |
| 3 |
| 4 |
| 7 |
| 1 |
| 2 |
| 1 |
| 4 |
| 3 |
| 4 |
=4×3
| 3 |
| 2 |
| 7 |
| 4 |
=12
| 3 |
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