问题 解答题
求值:(1)(
325
-
125
425

(2)2log525-3log264.
答案

(1)(

325
-
125
425

=(5

2
3
-5
3
2
5
1
2

=5

2
3
-
1
2
-5
3
2
-
1
2

=5

1
6
-5

=

65
-5.

(2)2log525-3log264

=2log552-3log226

=4-3×6

=-14.

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