题目内容
计算下列各式的值.
(1)3
log
4;
(2)32+log35;
(3)71-log75;
(4)4
(log29-log25).
(1)3
| 1 |
| 2 |
| 3 |
(2)32+log35;
(3)71-log75;
(4)4
| 1 |
| 2 |
(1)原式=3
log
4=3log
2=32log32=3log322=3log34=4.
(2)原式=32+log35=32?3log35=9×5=45.
(3)原式=71-log?75=7log?7
=
.
(4)4
(log?29-log?25)=22×
(log?2
)=2log?2
=
.
| 1 |
| 2 |
| 3 |
| 3 |
(2)原式=32+log35=32?3log35=9×5=45.
(3)原式=71-log?75=7log?7
| 7 |
| 5 |
| 7 |
| 5 |
(4)4
| 1 |
| 2 |
| 1 |
| 2 |
| 9 |
| 5 |
| 9 |
| 5 |
| 9 |
| 5 |
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