题目内容
化简下列各式:
(1)[(0.064
)-2.5]
-
-π0;
(2)
.
(1)[(0.064
| 1 |
| 5 |
| 2 |
| 3 |
| 3 | 3
| ||
(2)
| 2lg2+lg3 | ||||
1+
|
(1)原式={[(
)
]-
}
-(
)
-1(2分)
=[(
)3]
×(-
)×
-[(
)3]
-1(4分)
=
-
-1(6分)
=0(7分)
(2)原式=
=
(4分)
=
=
=(17分)
| 64 |
| 1000 |
| 1 |
| 5 |
| 5 |
| 2 |
| 2 |
| 3 |
| 27 |
| 8 |
| 1 |
| 3 |
=[(
| 4 |
| 10 |
| 1 |
| 5 |
| 5 |
| 2 |
| 2 |
| 3 |
| 3 |
| 2 |
| 1 |
| 3 |
=
| 5 |
| 2 |
| 3 |
| 2 |
=0(7分)
(2)原式=
| 2lg2+lg3 | ||||
1+
|
| 2lg2+lg3 | ||
1+lg
|
=
| 2lg2+lg3 |
| 1+lg2+lg3-lg10+lg2 |
| 2lg2+lg3 |
| 2lg2+lg3 |
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