问题 解答题
计算:
(1)-7+13+(-6)+20
(2)1+(-2)+|-3|-5
(3)1+(-
1
2
)+
1
3
+(-
1
6

(4)3
7
12
+(-1
1
4
)+(-3
7
12
)+1
1
4
+(-4
1
8
)
答案

(1)原式=-7+13-6+20

=-7-6+13+20

=-13+33

=20;

(2)原式=1-2+3-5

=-3;

(3)原式=1-

1
2
+
1
3
-
1
6

=

6
6
-
3
6
+
2
6
-
1
6

=

2
3

(4)原式=3

7
12
-1
1
4
-3
7
12
+1
1
4
-4
1
8

=-4

1
8

=-

33
8

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