28.9*61.3+111*6.15简便计算

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28.9*61.3+111*6.15简便计算28.9*61.3+111*6.15简便计算28.9*61.3+111*6.15简便计算=28.9*61.3+11.1*61.3+11.1*0.2=61.3

28.9*61.3+111*6.15简便计算
28.9*61.3+111*6.15简便计算

28.9*61.3+111*6.15简便计算
=28.9*61.3+11.1*61.3+11.1*0.2
=61.3(28.9+11.1)+2.22
=61.3*40+2.22
=2454.22

移动一下小数点,6.13=6.15-0.02