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计算:(1)(-21)+(-31)(2)(-3.125)+(+318)(3)(-2.7)-(+2.3)(4)(-3.7)-310(5)13-12(6)3+(-1)+(-3)+1+(-4)(7)(-6)-(-6)(8)(-36.35)+(-7.25)+26.35+(+714)(9)(+3

题目详情
计算:
(1)(-21)+(-31)
(2)(-3.125)+(+3
1
8
)   
(3)(-2.7)-(+2.3)
(4)(-3.7)-
3
10

(5)
1
3
-
1
2

(6)3+(-1)+(-3)+1+(-4)
(7)(-6)-(-6)
(8)(-36.35)+(-7.25)+26.35+(+7
1
4

(9)(+3
1
6
)-(-4
2
3
)  
(10)-7+6+9+(-8)+(-5)
(11)(3-9)-(4-8)
(12)(-
3
2
)+(-
5
12
)+
5
2
+(-
7
12

(13)6.1+(-3.7)+1.8+(-4.9 )
(14)(-3.1)+(-6.9)+(+3)
(15)(+9)-(+10)+(-2)-(-8)+3
(16)(-
1
3
)+(+
2
5
)+(+
3
5
)+(-1
2
3
)     
(17)-(-3
1
2
)-(+
5
6
)-(-2
3
4

(18)|-1
1
4
-(-2
1
3
)|-(-1
1
2
)      
(19)-5.4+0.2+(-0.6)+0.8
(20)2
2
5
+(-2
7
8
)+(-1
5
12
)+4
3
5
+(-1
1
8
)+(-3
7
12
▼优质解答
答案和解析
(1)原式=-21-31=-52;
(2)原式=0;
(3)原式=-2.7-2.3=-5;
(4)原式=-3.7-0.3=-4;
(5)原式=-
1
6

(6)原式=3-3-1+1-4=-4;
(7)原式=0;
(8)原式=(-36.35+26.35)+(-7.25+7
1
4
)=-10;
(9)原式=3
1
6
+4
2
3
=7
5
6

(10)原式=-7-8-5+6+9=-20+15=-5;
(11)原式=3-9-4+8=-13+11=-2;
(12)原式=-
3
2
+
5
2
-
5
12
-
7
12
=1-1=0;
(13)原式=6.1+1.8-3.7-4.9=7.9-8.6=-0.7;
(14)原式=-3.1-6.9+3=-10+3=-7;
(15)原式=9-10-2+8+3=8;
(16)原式=-
1
3
-1
2
3
+
2
5
+
3
5
=-2+1=-1;
(17)原式=3
1
2
-
5
6
+2
3
4
=5
5
12

(18)原式=1
1
4
+2
1
3
+1
1
2
=5
1
12

(19)原式=-5.4-0.6+0.2+0.8=-6+1=-5;
(20)原式=2
2
5
+4
3
5
-2
7
8
-1
1
8
-1
5
12
-3
7
12
=7-4-5=-2.