题目内容
(1)4x
(-3x
y-
)÷(-6x-
y-
)
(2)(0.027)
-(
)-2+(2
)
-(
-1)0.
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 3 |
| 1 |
| 2 |
| 2 |
| 3 |
(2)(0.027)
| 1 |
| 3 |
| 1 |
| 7 |
| 7 |
| 9 |
| 1 |
| 2 |
| 2 |
分析:直接分数指数幂运算法则,化简运算求解即可.
解答:解:(1)4x
(-3x
y-
)÷(-6x-
y-
)
=
x
+
-(-
)y-
-(-
)
=2xy
.
(2))(0.027)
-(
)-2+(2
)
-(
-1)0
=(0.3)3×
-72+(
)2×
-1
=-
.
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 3 |
| 1 |
| 2 |
| 2 |
| 3 |
=
| 4×3 |
| 6 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 2 |
| 1 |
| 3 |
| 2 |
| 3 |
=2xy
| 1 |
| 3 |
(2))(0.027)
| 1 |
| 3 |
| 1 |
| 7 |
| 7 |
| 9 |
| 1 |
| 2 |
| 2 |
=(0.3)3×
| 1 |
| 3 |
| 5 |
| 3 |
| 1 |
| 2 |
=-
| 1441 |
| 30 |
点评:本题考查根式与分数指数幂的互化及其化简运算以及有理指数幂的化简求值,是基础题.
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