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54.9x0.38有什么简便运算

54.9×0.38=(55-0.1)x0.38=55x0.38-0.1x0.38=20.9-0.038=20.862 简便计算是一种特殊的计算,它运用了运算定律与数字的基本性质,从而使计算简便,使一个很复杂的式子变得很容易计算出得数。 公式: 减法1:a-b-c=a-(b+c) 减法2:a-b-c=a-c-b 除...

54.9x0.38 =(55-0.1)x0.38 =0.38x55-0.38 =20.9-0.38 =20.52

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 简便计算:是一种特殊的计算,它运用了运算定律与数字的基本性质,从而使计算简便,使一个很复杂的式子变得很容易计算出得数。 定律:乘法分配...

1.54.9x0.38 =(55-0.1)×0.38 =0.38x55-0.38×0.1 =20.9-0.038 =20.862 2.54.9x0.38 =(55-0.1)×(0.4-0.02) =55×0.4-55×0.02-0.1×0.4+0.1×0.02 =22-1.1-0.04+0.002 =20.862

54.9x0.38简便计算 =54.9×0.3+54.9×0.08 =16.47+4.392 =20.862

54.9x0.38简便计算 54.9x0.38 = 20.862 直接计算

54.9*0.38 =(55-0.1)*0.38 =20.9-0.038 =20.862

(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=20.862列竖式计算

1.54.9x0.38 =(55-0.1)×0.38 =0.38x55-0.38×0.1 =20.9-0.038 =20.862 2.54.9x0.38 =(55-0.1)×(0.4-0.02) =55×0.4-55×0.02-0.1×0.4+0.1×0.02 =22-1.1-0.04+0.002 =20.862

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