题目内容
(1)计算:2
×
×
(2)计算:2log510+log50.25.
| 3 |
| 3 | 15 |
| 6 | 12 |
(2)计算:2log510+log50.25.
解(1)计算:2
×
×
=2
×
×
=2
=2
=6;
(2)2log510+log50.25
=log5102+log50.25
=log5100×0.25
=log525
=2log55=2.
| 3 |
| 3 | 15 |
| 6 | 12 |
=2
| 6 | 33 |
| 6 | (
| ||
| 6 | 12 |
=2
| 6 | 33×(
| ||
=2
| 6 | 36 |
(2)2log510+log50.25
=log5102+log50.25
=log5100×0.25
=log525
=2log55=2.
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