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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
)
(3)(-2.7)-(+2.3)
(4)(-3.7)-
(5)
-
(6)3+(-1)+(-3)+1+(-4)
(7)(-6)-(-6)
(8)(-36.35)+(-7.25)+26.35+(+7
)
(9)(+3
)-(-4
)
(10)-7+6+9+(-8)+(-5)
(11)(3-9)-(4-8)
(12)(-
)+(-
)+
+(-
)
(13)6.1+(-3.7)+1.8+(-4.9 )
(14)(-3.1)+(-6.9)+(+3)
(15)(+9)-(+10)+(-2)-(-8)+3
(16)(-
)+(+
)+(+
)+(-1
)
(17)-(-3
)-(+
)-(-2
)
(18)|-1
-(-2
)|-(-1
)
(19)-5.4+0.2+(-0.6)+0.8
(20)2
+(-2
)+(-1
)+4
+(-1
)+(-3
)
(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 |
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 |
2 |
3 |
(17)-(-3
1 |
2 |
5 |
6 |
3 |
4 |
(18)|-1
1 |
4 |
1 |
3 |
1 |
2 |
(19)-5.4+0.2+(-0.6)+0.8
(20)2
2 |
5 |
7 |
8 |
5 |
12 |
3 |
5 |
1 |
8 |
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=-
;
(6)原式=3-3-1+1-4=-4;
(7)原式=0;
(8)原式=(-36.35+26.35)+(-7.25+7
)=-10;
(9)原式=3
+4
=7
;
(10)原式=-7-8-5+6+9=-20+15=-5;
(11)原式=3-9-4+8=-13+11=-2;
(12)原式=-
+
-
-
=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
+
+
=-2+1=-1;
(17)原式=3
-
+2
=5
;
(18)原式=1
+2
+1
=5
;
(19)原式=-5.4-0.6+0.2+0.8=-6+1=-5;
(20)原式=2
+4
-2
-1
-1
-3
=7-4-5=-2.
(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 |
(9)原式=3
1 |
6 |
2 |
3 |
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 |
(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 |
2 |
3 |
2 |
5 |
3 |
5 |
(17)原式=3
1 |
2 |
5 |
6 |
3 |
4 |
5 |
12 |
(18)原式=1
1 |
4 |
1 |
3 |
1 |
2 |
1 |
12 |
(19)原式=-5.4-0.6+0.2+0.8=-6+1=-5;
(20)原式=2
2 |
5 |
3 |
5 |
7 |
8 |
1 |
8 |
5 |
12 |
7 |
12 |
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