题目内容
计算:
(1)-60×(-
+
-
+
)
(2)-2.5÷
×(-
)
(3)[-22+(-2)2]-(-2)×(-3)
(4)3×(-3)3-4×(-3)+15.
(1)-60×(-
| 1 |
| 5 |
| 1 |
| 2 |
| 1 |
| 12 |
| 1 |
| 6 |
(2)-2.5÷
| 5 |
| 8 |
| 1 |
| 4 |
(3)[-22+(-2)2]-(-2)×(-3)
(4)3×(-3)3-4×(-3)+15.
考点:有理数的混合运算
专题:
分析:(1)利用乘法分配律求解即可.
(2)利用有理数的混合运算顺序求解即可.
(3)利用有理数的混合运算顺序求解即可.
(4)利用有理数的混合运算顺序求解即可.
(2)利用有理数的混合运算顺序求解即可.
(3)利用有理数的混合运算顺序求解即可.
(4)利用有理数的混合运算顺序求解即可.
解答:解:(1)-60×(-
+
-
+
)
=-60×(-
)+(-60)×
-(-60)×
-60×
,
=12-30+5-10,
=-23.
(2)-2.5÷
×(-
)
=-
×
×(-
),
=1.
(3)[-22+(-2)2]-(-2)×(-3)
=(-4+4)-6,
=-6.
(4)3×(-3)3-4×(-3)+15.
=3×(-27)+12+15,
=-81+12+15,
=-54.
| 1 |
| 5 |
| 1 |
| 2 |
| 1 |
| 12 |
| 1 |
| 6 |
=-60×(-
| 1 |
| 5 |
| 1 |
| 2 |
| 1 |
| 12 |
| 1 |
| 6 |
=12-30+5-10,
=-23.
(2)-2.5÷
| 5 |
| 8 |
| 1 |
| 4 |
=-
| 5 |
| 2 |
| 8 |
| 5 |
| 1 |
| 4 |
=1.
(3)[-22+(-2)2]-(-2)×(-3)
=(-4+4)-6,
=-6.
(4)3×(-3)3-4×(-3)+15.
=3×(-27)+12+15,
=-81+12+15,
=-54.
点评:本题主要考查了有理数的混合运算,解题的关键是熟记有理数的混合运算顺序.
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