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54.9x0.38简便算法

54.9x0.38=(55-0.1)x0.38=0.38x55-0.038=20.9-0.038=20.862

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54.9x0.38的简便计算过程如下.54.9x0.38=(55-0.1)x(0.4-0.02)=55x(0.4-0.02)-0.1x(0.4-0.02)=55x0.4-55x0.02-0.1x0.4+0.1x0.02=22-1.1-0.04+0.002=20.862 扩展资料:1、简便计算中的运算定律 简便计算中的运算定律有加法结合律、加法交换律

54.9x0.38=(50+5-0.1)*0.38=19+1.9-0.038=20.8962

先用50*0.38请采纳答案,支持我一下.

法一:54.9x0.38=(55-0.1)x(0.5-0.12)=55x0.5-55x0.12-0.1x0.5+0.1x0.12=27.5-6.6-0.05+0.012=20.862 法二:54.9x0.38=(55-0.1)x(0.4-0.02) =55x0.4-55x0.02-0.1x0.4+0.1x0.02 =22-1.1-0.04+0.002 =20.862 希望帮到你 望采纳 谢谢 加油!!

=(55-0.1)x0.38 =55x0.38-0.1*0.38 =20.9-0.38 =20.52

(55-0.1)*(0.4-0.02)=55*0.4-55*0.02-0.1*0.+-0.1*0.02=22-1.1-0.04+0.002=20.862

54.9X0.38=(55-0.1)X(0.4-0.02) =55X0.4-55X0.02-0.1X0.4+0.1X0.02 =22-1.1-0.04+0.002 =20.862

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