(1)(-8)+10+2+(-1);(2)5+(-5)+3+9+(-4)+(-7);(3)(-0.8)+1.2+(-0.7)+(-2.1)+0.8+3.5;(4)1/2+(-2/3)+4/5+(-1/2)+(-1/3).1、食品店一周中各天的盈亏情况如下(盈亏为正):132
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