问题 解答题
计算:
(1)0-1+2-3+4-5;
(2)-4.2+5.7-8.4+10.2;
(3)-30-11-(-10)+(-12)+18;
(4)(+
1
2
)-(-
4
5
)+(-
2
3
)-(+
1
2
)+(-
1
3
);
(5)|-7
3
8
+4
1
2
|+(-18
1
4
)+|-6-
1
2
|;
(6)3
1
2
-(-2
1
4
)+(-
1
3
)-0.25+(+
1
6
).
答案

(1)原式=(2+4)+(-1-3-5)=6-9=-3;

(2)原式=(5.7+10.2)+(-4.2-8.4)=15.9-12.6=3.3;

(3)原式=-30-11+10-12+18=(-30-11-12)+(10+18)=-53+28=-25;

(4)原式=

1
2
+
4
5
-
2
3
-
1
2
-
1
3
=
4
5
-1=-
1
5

(5)原式=3

1
8
-18
1
4
+6
1
2
=9
5
8
-18
2
8
=-9
3
8

(6)原式=3

1
2
+2
1
4
-
1
3
-
1
4
+
1
6
=3
1
3
-2=1
1
3

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