20道简便计算题
比如0.87×0.25+0.087×7.5=0.87×0.25+0.87×0.75=0.87×（0.25+0.75）=0.87×1=0.87...
比如0.87×0.25+0.087×7.5
=0.87×0.25+0.87×0.75
=0.87×（0.25+0.75）
=0.87×1
=0.87 展开
=0.87×0.25+0.87×0.75
=0.87×（0.25+0.75）
=0.87×1
=0.87 展开
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