题目内容
计算:
(1)2+5-8
(2)
+(-
)-(-
)
(3)-0.75×(-1
)÷(-2
)
(4)-52+2×(-3)2-(-6)÷(-1
)
(5)(-24)×(
-
+
)+(-2)3
(6)421×
+0.25×7
-28.5×
(要求简便计算)
(1)2+5-8
(2)
5 |
7 |
1 |
7 |
2 |
7 |
(3)-0.75×(-1
1 |
2 |
1 |
4 |
(4)-52+2×(-3)2-(-6)÷(-1
1 |
2 |
(5)(-24)×(
1 |
8 |
1 |
3 |
1 |
4 |
(6)421×
1 |
4 |
1 |
2 |
1 |
4 |
(1)原式=7-8=-1;
(2)原式=
-
+
=
=
;
(3)原式=-
×(-
)×(-
)=-
;
(4)原式=-25+18-4=-11;
(5)原式=-3+8-6-8=-9;
(6)原式=
×(421+7.5-28.5)=
×400=100.
(2)原式=
5 |
7 |
1 |
7 |
2 |
7 |
5-1+2 |
7 |
6 |
7 |
(3)原式=-
3 |
4 |
3 |
2 |
4 |
9 |
1 |
2 |
(4)原式=-25+18-4=-11;
(5)原式=-3+8-6-8=-9;
(6)原式=
1 |
4 |
1 |
4 |
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