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125x(20十8)怎样简便运算的

125x(20十8) =125x20+125x8 =2500+1000 =3500

125×(8+20) =125*8+125*20 =1000+2500 =3500

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

(125*8)*(25*4)*(20*5)*14

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

15×125×2x8 =(15×2)x(125×8) =30×1000 =30000

(30+8)x25 =30x25+8x25 =750+200 =950; 75x141-75x40 =75x(141-40) =75x101 =75x100+75x1 =7500+75 =7575; 125x18 =125x10+125x8 =1250+1000 =2250; 供参考。

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:

20.2乘8-10.2除以0.125 =20.2×8-10.2×8 =(20.2-10.2)×8 =10×8 =80;

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