101*0.87-0.91*87咋么简便计算?

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101*0.87-0.91*87咋么简便计算?
101*0.87-0.91*87咋么简便计算?

101*0.87-0.91*87咋么简便计算?
101*0.87-0.91*87
=101*0.87-0.91*100*0.87
=101*0.87-91*0.87
=(101-91)*0.87
=10*0.87
=8.7

101*0.87-0.91*87
=101×0.87-91×0.87
=(101-91)×0.87
=10×0.87
=8.7
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101*0.87-0.91*87
=1.01*87-0.91*87
=(1.01-0.91)*87
=0.1*87
=8.7