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2.58%2.09+16.42%7.91简便计算

原式 =29×16+29x2×42 =29×16+29x84 =29×(16+84) =29×100 =2900

2.58+16.42-(2.19+7.81) =19-10 =9

29×16+58×42 =29×16+29×2×42 =29×16+29×84 =29×(16+84) =29×100 =2900

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