题目内容
化简或计算:
(1)(
)
-[3×(
)0]-1-[81-0.25+(3
) -
] -
-10×0.027
;
(2)
+[1-2(
)
]×
.
(1)(
10000 |
81 |
1 |
4 |
7 |
8 |
3 |
8 |
1 |
3 |
1 |
2 |
1 |
3 |
(2)
a
| |||||||
a
|
b |
a |
1 |
3 |
3 | a |
分析:根据有理数指数幂的运算法则进行化简求值即可.
解答:解:(1)原式=(
)4×
-(3×1)-1-[34×(-0.25)+(
)3×(-
)]-
-10×0.33×
=
-
-1-3
=-1.
(2)原式=
+
-2
=a
(a
-2b
)+
-2
=
-2
+
-2
.
10 |
3 |
1 |
4 |
3 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=
10 |
3 |
1 |
3 |
=-1.
(2)原式=
a
| ||||||||||||||
a
|
3 | a |
3 | b |
=a
1 |
3 |
1 |
3 |
1 |
3 |
3 | a |
3 | b |
=
3 | a2 |
3 | ab |
3 | a |
3 | b |
点评:本题考查有理数指数幂的运算法则,考查学生的运算能力,属基础题,熟记有关运算法则是解决问题的基础.

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