问题
解答题
计算: (1)(-10)+15; (2)(-0.9)+(-3.6); (3)0+(-4.5); (4)15-(-7); (5)(-2.7)-(+2.3); (6)
(7)18+(-12)+(-21)+(+12); (8)0.35+(-0.6)+0.25+(-5.4); (9)-26+43-24+13-46; (10)(-3
|
答案
(1)(-10)+15=5;
(2)(-0.9)+(-3.6)=-4.5;
(3)0+(-4.5)=-4.5;
(4)15-(-7)=15+7=22;
(5)(-2.7)-(+2.3)=-2.7-2.3=-5;
(6)
-1 3
=1 4
;1 12
(7)18+(-12)+(-21)+(+12)=18-12-21+12=18-21=-3;
(8)0.35+(-0.6)+0.25+(-5.4)=0.6-6=-5.4;
(9)-26+43-24+13-46=-96+56=-40;
(10)(-3
)+12.5+(-163 7
)+(-2.5)=-20+10=-10.4 7