1/4*3.5*5.4 / 0.9*3*2.5*4 - 知识问答

1/4*3.5*5.4 / 0.9*3*2.5*4.9 ji简便方法

1个回答

1/4*3.5*5.4 / 0.9*3*2.5*4.9
=（5.4/0.9）*1/4*7/2*3*5/2*4.9
=6*7*5*4.9/16
=210*4.9/16
=21*49/16
=21*（48+1）/16
=21*48/16+21/16
=84+21/16
=85又5/16

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