题目内容
计算:
(1)-14-
×[2-(-3)2];
(2)(-1)4-(1-0.5)×
×[2-(-2)2];
(3)(-2)2-22-|-
|×(-1)2;
(4)(-2
)×(-0.5)3×(-2)2×(-8).
(1)-14-
| 1 |
| 6 |
(2)(-1)4-(1-0.5)×
| 1 |
| 3 |
(3)(-2)2-22-|-
| 1 |
| 4 |
(4)(-2
| 1 |
| 2 |
分析:分别根据有理数的混合运算顺序,先算乘方,再算乘除,最后算加减,有括号先算括号里面的进行计算即可得解.
解答:解:(1)-14-
×[2-(-3)2],
=-1-
×(2-9),
=-1+
,
=
;
(2)(-1)4-(1-0.5)×
×[2-(-2)2],
=1-
×
×(2-4),
=1+
,
=
;
(3)(-2)2-22-|-
|×(-1)2,
=4-4-
×1,
=-
;
(4)(-2
)×(-0.5)3×(-2)2×(-8),
=-
×(-
)×4×(-8),
=-
×
×4×8,
=-10.
| 1 |
| 6 |
=-1-
| 1 |
| 6 |
=-1+
| 7 |
| 6 |
=
| 1 |
| 6 |
(2)(-1)4-(1-0.5)×
| 1 |
| 3 |
=1-
| 1 |
| 2 |
| 1 |
| 3 |
=1+
| 1 |
| 3 |
=
| 4 |
| 3 |
(3)(-2)2-22-|-
| 1 |
| 4 |
=4-4-
| 1 |
| 4 |
=-
| 1 |
| 4 |
(4)(-2
| 1 |
| 2 |
=-
| 5 |
| 2 |
| 1 |
| 8 |
=-
| 5 |
| 2 |
| 1 |
| 8 |
=-10.
点评:本题考查了有理数的乘方,有理数的混合运算,要注意-14和(-1)4的区别.
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