题目内容
计算
(1)(
-
-
)×(-27)
(2)(-1)2003+(-3)2×|-
|-42
(3)-
+
+
(4)30÷(
-
).
(1)(
2 |
9 |
1 |
3 |
2 |
27 |
(2)(-1)2003+(-3)2×|-
2 |
9 |
(3)-
3 | 216 |
3 | 125 |
(-3)2 |
(4)30÷(
1 |
5 |
1 |
6 |
分析:(1)利用乘法分配律进行计算即可;
(2)先算乘方,再算乘法,最后算加减即可;
(3)先算开方,再算加减即可;
(4)先算括号里面的,再算除法.
(2)先算乘方,再算乘法,最后算加减即可;
(3)先算开方,再算加减即可;
(4)先算括号里面的,再算除法.
解答:解:(1)原式=
×(-27)-
×(-27)-
×(-27)
=-6+9+2
=5;
(2)原式=-1+9×
-16
=-1+2-16
=-15;
(3)原式=-6+5+3
=2;
(4)原式=30÷
=30×30
=900.
2 |
9 |
1 |
3 |
2 |
27 |
=-6+9+2
=5;
(2)原式=-1+9×
2 |
9 |
=-1+2-16
=-15;
(3)原式=-6+5+3
=2;
(4)原式=30÷
1 |
30 |
=30×30
=900.
点评:本题考查的是实数的运算,在解答此类题目时要注意各种运算律的灵活应用.
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