计算:-(+0.5)-(-3又1/4)+2.75-(+7又1/2) (要正确过程,必采纳

计算:-(+0.5)-(-3又1/4)+2.75-(+7又1/2) (要正确过程,必采纳~)

第1个回答  2017-05-25
原式=-(+0.5)-(-3.25)+2.75-(+7.5)
=(3.25+2.75)-(0.5+7.5)
= 6-8=-2
第2个回答  2017-05-09
原式= -0.5+3.25+2.75-7.5
= (-0.5-7.5)+(3.25+2.75)
= -8+6
= -2
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