.87×0.25+0.087×7.5
=0.87×0.25+0.87×0.75
=0.87×（0.25+0.7)
=0.87
简便计算 99*2.5+2.5 6.4*4.5+3.6*4.5 6.25/0.25+0.75 99*2.5+2.5 42
2个回答
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