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2.28×3.1 7.9×7.28%7.28

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

7.28×99+7.2怎样简便 解: 采用分配律, 原式=7.28×99+7.2 =7.28x99+7.28-0.08 =7.28x(99+1)-0.08 =7.28x100-0.08 =728-0.08 =727.92

7.28_2.28×1.5用简便方法计算 =7.28×(1-1.5) =7.28×(-0.5) =3.64

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

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-(1.28+0.25) =7.28-1.28-0.25 =6-0.25 =5.75

7.28*4.6+46*1.272 =7.28*4.6+4.6*12.72 =4.6*(7.28+12.72) =4.6*20 =92

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