计算:(1)2+5-8(2)57+(-17)-(-27)(3)-0.75×(-112)÷(-214)(4)-52+2×(-3)2-(-6)÷(-112)(5)(-24)×(18-13+14)+(-2)

题目简介

计算:(1)2+5-8(2)57+(-17)-(-27)(3)-0.75×(-112)÷(-214)(4)-52+2×(-3)2-(-6)÷(-112)(5)(-24)×(18-13+14)+(-2)

题目详情

计算:
(1)2+5-8
(2)
5
7
+(-
1
7
)-(-
2
7

(3)-0.75×(-1
1
2
)÷(-2
1
4

(4)-52+2×(-3)2-(-6)÷(-1
1
2

(5)(-24)×(
1
8
-
1
3
+
1
4
)+(-2)3

(6)421×
1
4
+0.25×7
1
2
-28.5×
1
4
(要求简便计算)
题型:解答题难度:中档来源:不详

答案

(1)原式=7-8=-1;

(2)原式=class="stub"5
7
-class="stub"1
7
+class="stub"2
7
=class="stub"5-1+2
7
=class="stub"6
7


(3)原式=-class="stub"3
4
×(-class="stub"3
2
)×(-class="stub"4
9
)=-class="stub"1
2


(4)原式=-25+18-4=-11;

(5)原式=-3+8-6-8=-9;

(6)原式=class="stub"1
4
×(421+7.5-28.5)=class="stub"1
4
×400=100.

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