题目内容
计算
(1)lg20-lg2-log23•log32+2log
(2)(
-1)0+(
) -
+(
) -
.
(1)lg20-lg2-log23•log32+2log
|
(2)(
| 2 |
| 16 |
| 9 |
| 1 |
| 2 |
| 8 |
| 4 |
| 3 |
(1)原式=lg
-
•
+
=1-1+
=
;
(2)原式=1+(
)2×(-
)+2
×(-
)
=1+
+2-2
=1+
+
=2.
| 20 |
| 2 |
| lg3 |
| lg2 |
| lg2 |
| lg3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
(2)原式=1+(
| 4 |
| 3 |
| 1 |
| 2 |
| 3 |
| 2 |
| 4 |
| 3 |
=1+
| 3 |
| 4 |
=1+
| 3 |
| 4 |
| 1 |
| 4 |
=2.
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