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)(+12)-(-45)+(-23)-(+12)+(-13);(5)|-738+412|+(-1814)+|-6-12|;(6)312-(-214)+(-13)-0.-数学
题文
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
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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=
(5)原式=3
(6)原式=3
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