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2.28乘3.1加7.9乘7.28%7.28简便计算

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

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减2.28乘1.5简便算 7.28减2.28乘1.5 =7.28-3.42 =3.86 直接计算

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