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125x(20十8)怎样简便运算的

(20+8)x125 =20x125+8x125 =2500+1000 =3500

47X15(20十8)=47X(20X15十8X15)=47X(300十120)=47X420=47X400+47X20=18800+940=19740

你好! 28×38+72×38 =38×(28+72) =38×100 =3800; 希望能帮到你请采纳谢谢!

一百二十五乘以二十五乘以六十四 =125×25×4×8×2 =(125×8)×(25×4)×2 =1000×100×2 =200000

解: 23*11.8+460*0.91 =23*11.8+23*(20*0.91) =23*(11.8+18.2) =23*30 =690

99X28+28 =(99+1)X28 =100X28 =2800 竖式见图:

七十八乘五十六减五十六乘二十八的简便运算 =56x(78-28) =56x50 =50x50+6x50 =2500+300 =2800

20.4÷[(8.28-1.48)x0.3] =20.4÷(6.8×0.3) =20.4÷6.8÷0.3 =3÷0.3 =10

20.5-10.74-8.35x5.5用简便运算 20.5-10.74-8.35x5.5 =20.5-10.74-45.925 =-36.165 直接计算 没有简算

20.1x35.22-3.522 =20.1x35.22-35.22x0.1 =(20.1-0.1)x35.22 =20x35.22 =704.4

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