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

2024-11-25 01:48:02
推荐回答(1个)
回答1:

(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