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54.9 0.38简便计算脱式

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

54.9*0.38=(55-0.1)*0.38=55*0.38-0.1*0.38=55*2*0.19-0.038=110*0.19-0.038=20.9-0.038=20.862

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

54.9*0.38=54.9*0.4-54.9*0.02=219.6-1.098=218.502

54.9x0.38=54.9x(0.4-0.02)=54.9x0.4-54.9x0.02=21.9-1.098=20.862

54.9*0.38=(50+5-0.1)*0.38=50*0.38+5*0.38-0.1*0.38=19+1.9-0.38=20.52

=(55-0.1)X0.38=55X0.38-0.1X0.38=20.9-0.038=20.862 如果你认可我的回答,敬请及时采纳 在我回答的右上角点击【采纳答案】 若有疑问,可继续追问,谢谢

50*0.38+4.9*0.38 打字不易,如满意,望采纳.

54.9*0.38=(60-5.1)*(0.5-0.12)=60*0.5-60*0.12-5.1*0.5+5.1*0.12=30-7.2-2.55+0.612=20.862

0.38x102 =0.38*(100+2) =0.38*100+0.38*2 =38+0.76 =38.76

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