题目内容
计算.
(1)32 -
-(2
) -
+0.5-2;
(2)1.5 -
×(-
)0+80.25×
+(
×
)6-
;
(3)0.027 -
+(
)
-4×(
) -
-
×80.25+(-2011)0.
(1)32 -
3 |
5 |
10 |
27 |
2 |
3 |
(2)1.5 -
1 |
3 |
7 |
6 |
4 | 2 |
3 | 2 |
3 |
(-
|
(3)0.027 -
1 |
3 |
2
|
4 |
3 |
16 |
49 |
1 |
2 |
4 | 2 |
分析:利用有理数指数幂的运算性质对(1)、(2)、(3)逐个运算即可.
解答:解:(1)原式=(25)-
-(
)-
+22
=2-3-[(
)3]-
+22
=
-
+4=
.
(2)原式=(
)
×1+(23)
×2
+22×33-(
)
=2+4×27=110
(3)原式=[(
)3]-
+(
)
-4×
-2
×2
+1
=
+2-7-2+1
=-
.
3 |
5 |
64 |
27 |
2 |
3 |
=2-3-[(
4 |
3 |
2 |
3 |
=
1 |
8 |
9 |
16 |
57 |
16 |
(2)原式=(
2 |
3 |
1 |
3 |
1 |
4 |
1 |
4 |
2 |
3 |
1 |
3 |
(3)原式=[(
3 |
10 |
1 |
3 |
4 | 8 |
4 |
3 |
7 |
4 |
1 |
4 |
3 |
4 |
=
10 |
3 |
=-
8 |
3 |
点评:本题考查有理数指数幂的化简求值,熟练掌握有理数指数幂的运算性质是关键,考查运算能力,属于中档题.
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