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2.28×3.1+7.9×7.28%7.28用简便算法计算

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

题目是这样吗,我怎么感觉最前面也应该是7.28

(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

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

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

7.28X3.1+7.9X7.28-7.28 =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

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