题目内容
计算:
(1)(-2)÷[(-
)2÷(
)3]×|-
|;
(2)-
×(-2)2-(-
)×42.
(1)(-2)÷[(-
| 1 |
| 2 |
| 1 |
| 2 |
| 3 |
| 4 |
(2)-
| 1 |
| 4 |
| 1 |
| 2 |
考点:有理数的混合运算
专题:
分析:(1)先算乘方和绝对值,再算括号里面的除法,最后算括号外面的除法和乘法;
(2)先算乘方,再算乘法,最后算减法.
(2)先算乘方,再算乘法,最后算减法.
解答:解:(1)(-2)÷[(-
)2÷(
)3]×|-
|
=(-2)÷[
÷(
)]×
=(-2)÷2×
=-
;
(2)-
×(-2)2-(-
)×42
=-
×4-(-
)×16
=-1-(-8)
=-1+8
=7.
| 1 |
| 2 |
| 1 |
| 2 |
| 3 |
| 4 |
=(-2)÷[
| 1 |
| 4 |
| 1 |
| 8 |
| 3 |
| 4 |
=(-2)÷2×
| 3 |
| 4 |
=-
| 3 |
| 4 |
(2)-
| 1 |
| 4 |
| 1 |
| 2 |
=-
| 1 |
| 4 |
| 1 |
| 2 |
=-1-(-8)
=-1+8
=7.
点评:此题考查有理数的混合运算,注意运算顺序与运算符号的判定.
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