7.4*0.28+7.2*0.74怎么简算

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7.4*0.28+7.2*0.74怎么简算
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7.4*0.28+7.2*0.74怎么简算
7.4*0.28+7.2*0.74怎么简算

7.4*0.28+7.2*0.74怎么简算
7.4*0.28+7.2*0.74
=0.74x2.8+0.74x7.2
=0.74x(2.8+7.2)
=0.74x10
=7.4

=0.74*2.8+7.2*0.74=0.74*(2.8+7.2)=0.74*10=7.4