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6.25x2.8+37.5x0.28简算

解:6.25x2.8+37.5x0.28简算6.25x2.8+37.5x0.28=(6.25x2.8)+(3.75X2.8)=2.8X(6.25+3.75)=2.8X10=28

37.5*2.8+6.25*28=37.5*2.8+62.5*2.8=(37.5+62.5)*2.8=100*2.8=280

6.25x5.6+37.5x0.56=0.56*(62.5+37.5)=0.56*100=56希望能帮到你学习进步

37.5x0.79+6.25x7.9=3.75*7.9+6.25*7.9=(3.75+6.25)*7.9=10*7.9=79望楼主采纳就是两个数相乘,扩大几倍,另一个就缩小相同的倍数,结果不变用的是这个原理,在乘法分配律

6.25x8.4+37.5x0.84简便计算=6.25x8.4+3.75x8.4=(6.25+3.75)x8.4=10x8.4=84

(1)=6.25*(1+0.02)=6.25+0.125=6.375(2)=37.5*(4.8+5.2)=37.5*10=375(3)=52*(10-0.1)=52*10-52*0.1=520-5.2=514.8 (4)=8*0.125+8*1.25+8*12.5=1+10+100=1115同上(6)=5.86*(99+1)=5.86*100=586

6.25x2.8+4.2 =(25/4)x(14/5)+4.2 =17.5+4.2 =21.7

解:9.9x2.8+0.28=99x0.28+0.28=0.28x(99+1)=0.28x100=28

32.5*2.8 + 6.45 怎样简算=(30+2.5)*(3-0.2)+6.45=97.5-6-0.5+6.45=97.45

6.25*3.7+37.5*0.37 = 37

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