题目内容
计算
(1)(2
)
+0.1-2+(2
)-
-3π0+
(2)(a
b
)(-3a
b
)÷(
a
b
).
(1)(2
7 |
9 |
1 |
2 |
10 |
27 |
2 |
3 |
37 |
48 |
(2)(a
2 |
3 |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
6 |
5 |
6 |
分析:(1)化带分数为假分数,化小数为分数,然后直接利用有理指数幂的运算性质化简求值;
(2)直接利用同底数幂的运算性质化简求值.
(2)直接利用同底数幂的运算性质化简求值.
解答:解:(1)(2
)
+0.1-2+(2
)-
-3π0+
=(
)
+(
)-2+(
)-
-3+
=
+100+[(
)3]-
-3+
=
+100+
-3+
=100;
(2)(a
b
)(-3a
b
)÷(
a
b
)
=-3×3a
+
-
b
+
-
=-9a.
7 |
9 |
1 |
2 |
10 |
27 |
2 |
3 |
37 |
48 |
=(
25 |
9 |
1 |
2 |
1 |
10 |
64 |
27 |
2 |
3 |
37 |
48 |
=
5 |
3 |
4 |
3 |
2 |
3 |
37 |
48 |
=
5 |
3 |
9 |
16 |
37 |
48 |
=100;
(2)(a
2 |
3 |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
6 |
5 |
6 |
=-3×3a
2 |
3 |
1 |
2 |
1 |
6 |
1 |
2 |
1 |
3 |
5 |
6 |
=-9a.
点评:本题考查了有理指数幂的化简与求值,考查了有理指数幂的运算性质,是基础的计算题.
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