(-0.5)-[(-13/4)+2.75-(15/2)]=

(-0.5)-[(-13/4)+2.75-(15/2)]=

第1个回答  2017-09-18
(-0.5)-[(-13/4)+2.75-(15/2)]
=-0.5-(-3.25+2.75-7.5)
=-0.5-(-0.5-7.5)
=-0.5+0.5+7.5
=7.5本回答被网友采纳
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