问题
解答题
计算: (1)-7+13+(-6)+20 (2)1+(-2)+|-3|-5 (3)1+(-
(4)3
|
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
-17 12
-31 4
+17 12
-41 4 1 8
=-41 8
=-
.33 8