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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

2.28*3.1十7.9x7.28一 7.28 =7.068+57.512-7.28 =57.3

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

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

7.28×(100-1)+7.2 =728-7.28+7.2 =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

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