42720除89乘105怎么巧算
42720除89乘105怎么巧算 -
=42720x(100+5)/89 =(42720x100+42720x5)/89 =(4272000+213600)/89 =4485600/89 =50400
=42720x(100+5)/89 =(42720x100+42720x5)/89 =(4272000+213600)/89 =4485600/89 =50400
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