计算:(1)(-81)-(-29)(2)5+(-14)+(-6)-(-7)(3)|-2|+|3.2|-|-2.5|(4)(+12)-(-13)-(+14)(5)(+4.85)+(-3.25)(6)(-

题目简介

计算:(1)(-81)-(-29)(2)5+(-14)+(-6)-(-7)(3)|-2|+|3.2|-|-2.5|(4)(+12)-(-13)-(+14)(5)(+4.85)+(-3.25)(6)(-

题目详情

计算:
(1)(-81)-(-29)
(2)5+(-14)+(-6)-(-7)
(3)|-2|+|3.2|-|-2.5|
(4)(+
1
2
)-(-
1
3
)-(+
1
4

(5)(+4.85)+(-3.25)
(6)(-2.7)-(+2.3)
(7)(-36.35)+(-7.25)+26.35+(+7
1
4
)+10
(8)2
2
5
+(-2
7
8
)+(-1
5
12
)+4
3
5
+(-1)+(-3
7
12
题型:解答题难度:中档来源:不详

答案

(1)原式=-81+29=-(81-29)=-52;
(2)原式=5-14-6+7=12-20=-8;
(3)原式=2+3.2-2.5=2.7;
(4)原式=class="stub"1
2
+class="stub"1
3
-class="stub"1
4
=class="stub"7
12

(5)原式=1.6;
(6)原式=-2.7-2.3=-5;
(7)原式=(-36.35+26.35+10)+(-7.25+7.25)=0;
(8)原式=(2class="stub"2
5
+4class="stub"3
5
)+(-1class="stub"5
12
-3class="stub"7
12
)-1-2class="stub"7
8
=7-5-1-2class="stub"7
8
=-1class="stub"7
8

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