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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