求解答要过程谢谢
2个回答
2013-10-17
展开全部
(-0.75)+(+3.25)-(-0.125)-(-0.25)+(+0.625)
=-0.75+3.25+0.125+0.25+0.625
=-0.75+3.25+0.25+(0.125+0.625)
=-0.75+3.25+0.25+0.75
=3.5
=-0.75+3.25+0.125+0.25+0.625
=-0.75+3.25+0.25+(0.125+0.625)
=-0.75+3.25+0.25+0.75
=3.5
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