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2.28乘3.1加7.9乘7.28%7.28简便计算

题目是这样吗,我怎么感觉最前面也应该是7.28

=7.28x(3.1+7.9-1) =7.28x10 =72.8

可能你的题目有错 7.28X3.1+7.9X7.28-7.28 =7.28×3.1+7.28×7.9-7.28×1 =7.28×(3.1+7.9-1) =7.28×10 =72.8

用简便方法计算 7.28-2.28×1.5 =7.28-2.28-2.28x0.5 =5-1.14 =3.86

7.28×3.1 +7.9×7.28-7.28 =7.28×(3.1 +7.9-1) =7.28×10 =72.8

(2.28x3.1)+(7.9x7.28)-7.28=7.068+57.512-7.28=57.3

7.28减2.28乘1.5用简便方法计算 =7.28-2.28-2.28x0.5 =5-1.14 =3.86

7.28-2.28*1.5 =7.28-1.14*3 =7.28-3.42 =3.86

7.28*9.9+7.28*0.1 =7.28*(9.9+0.1) =7.28*10 =72.8 16.5*10.2-16.5*0.2 =16.5*(10.2-0.2) =16.5*10 =165

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