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2.28X3.1+7.9X7.28%7.28

7.28X3.1+7.9X7.28-7.28 =7.28X(3.1+7.9-1) =7.28X10 =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

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

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