题目内容
计算下列各式
(1)(a
b
)(-3a
b
)÷(
a
b
)
(2)[(0.3)3] -
-(-
)-2+(44)
-3-1+(
-1)0.
(1)(a
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 6 |
| 5 |
| 6 |
(2)[(0.3)3] -
| 1 |
| 3 |
| 1 |
| 7 |
| 3 |
| 4 |
| 2 |
分析:(1)首先利用同底数的幂的乘法运算化简前两个括号内的式子,然后利用同底数幂的除法运算进行化简即可;
(2)直接利用有理指数幂的公式进行化简求值.
(2)直接利用有理指数幂的公式进行化简求值.
解答:解:(1)(a
b
)(-3a
b
)÷(
a
b
)
=(-3a
+
b
+
)÷(
a
b
)
=(-3a
b
)÷(
a
b
)
=-9a
-
b0
=-9a.
(2)[(0.3)3] -
-(-
)-2+(44)
-3-1+(
-1)0
=(0.3)-1-(-7)2+43-
+1
=
-49+64-
+1
=19.
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 6 |
| 5 |
| 6 |
=(-3a
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 6 |
| 5 |
| 6 |
=(-3a
| 7 |
| 6 |
| 5 |
| 6 |
| 1 |
| 3 |
| 1 |
| 6 |
| 5 |
| 6 |
=-9a
| 7 |
| 6 |
| 1 |
| 6 |
=-9a.
(2)[(0.3)3] -
| 1 |
| 3 |
| 1 |
| 7 |
| 3 |
| 4 |
| 2 |
=(0.3)-1-(-7)2+43-
| 1 |
| 3 |
=
| 10 |
| 3 |
| 1 |
| 3 |
=19.
点评:本题考查有理指数幂的化简求值,解答的关键是熟记有关公式,此题是基础题.
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