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5.15*3.7+6.3*5.15简便算法

5.15*3.7+6.3*5.15 =5.15*(3.7+6.3) =5.15×10 =51.5

(5.15×3.7)+(6.3×5.15) =5.15×(3.7+6.3) =5.15×10 =51.5

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