99.99乘77.78+33.33乘66.66用简便计算怎么算

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99.99乘77.78+33.33乘66.66用简便计算怎么算
99.99乘77.78+33.33乘66.66用简便计算怎么算

99.99乘77.78+33.33乘66.66用简便计算怎么算
上式=99.99×(77.78+22.22)=99.99×100=9999

99.99×77.78+33.33×66.66
=99.99×77.78+99.99×22.22
=99.99×(77.78+22.22)
=99.99×100
=9999

33.33乘三分之二,66.66除以三分之二,就得到这样的式子:
99.99×77.78+22.22×99.99
=99.99×(77.78+22.22)
=99.99×100
=9999