题目内容
不用计算器计算下列各式的值:
(1)(a
b
)(-3a
b
)÷(
a
b
);
(2)log3
+lg25+lg4-3log32.
(1)(a
2 |
3 |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
6 |
5 |
6 |
(2)log3
| ||
3 |
(1)原式=-9a
+
-
b
+
-
=-9ab0=-9a.
(2)原式=log33-
+lg(25×4)-2=-
+2-2=-
.
2 |
3 |
1 |
2 |
1 |
6 |
1 |
2 |
1 |
3 |
5 |
6 |
(2)原式=log33-
1 |
2 |
1 |
2 |
1 |
2 |
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