用简便方法计算:41.2x8.1十11x1.25十53.7x1.9
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41.2x8.1十11x1.25十53.7x1.9
=41.2x(10-1.9)十11x1.25十53.7x1.9
=41.2x10-41.2x1.9十11x1.25十53.7x1.9
=41.2x10十53.7x1.9-41.2x1.9十11x1.25
=41.2x10十(53.7-41.2)x1.9十11x1.25
=41.2x10十12.5x1.9十11x1.25
=41.2x10十1.25x19十11x1.25
=41.2x10十(19十11)x1.25
=41.2x10十30x1.25
=41.2x10十10x3.75
=(41.2十3.75)x10
=44.95x10
=449.5
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