题目内容
化简:
(1)
(a>0,b>0);
(2)
-
+
+[(0.064
)-2.5]
-π.
(1)
| |||||||||
(a
|
(2)
6
|
| 3 | 3
| ||
| 4 | 0.0625 |
| 1 |
| 3 |
| 2 |
| 5 |
分析:把根式化为分数指数幂,再利用幂的运算性质即可得出.
解答:解:(1)原式=
=
=a
+
-
b1+
-
=
;
(2)原式=(
)
-(
)
+(
)
+(
)
×(-2.5)×
-π0
=
-
+
+(
)-1-1=3.
a
| ||||||
ab2•(
|
a
| ||||||
a
|
| 3 |
| 2 |
| 1 |
| 6 |
| 2 |
| 3 |
| 1 |
| 3 |
| 7 |
| 3 |
| a |
| b |
(2)原式=(
| 25 |
| 4 |
| 1 |
| 2 |
| 27 |
| 8 |
| 1 |
| 3 |
| 625 |
| 10000 |
| 1 |
| 4 |
| 64 |
| 1000 |
| 1 |
| 3 |
| 2 |
| 5 |
=
| 5 |
| 2 |
| 3 |
| 2 |
| 1 |
| 2 |
| 2 |
| 5 |
点评:熟练掌握指数幂的运算性质是解题的关键.
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