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)(+
(5)|-7
(6)3
|
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
-1=-4 5
;1 5
(5)原式=3
-181 8
+61 4
=91 2
-185 8
=-92 8
;3 8
(6)原式=3
+21 2
-1 4
-1 3
+1 4
=31 6
-2=11 3
.1 3