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2.1*12.5*4.8简便算

2.1×(12.5×4)×1.2=2.1×60=126

2.1乘以12.5乘以4.8 =2.1×12.5×(8×0.6) =(2.1×0.6)×(12.5×8) =1.26×100 =126

1.2+8.8×12.5 =1.2+8x12.5+0.8x12.5 =1.2+100+10 =111.2

如图

4.82+7.3+5.18把加12.7怎么简算 4.82+7.3+5.18加12.7 =(4.82+5.18)+(7.3+12.7) =10+20 =30

1/8+5/12-1/2 =1/8+5/12-6/12 =1/8-1/12 =3/24-2/24 =1/24

0.12乘5加1.2乘50=?简便用算 0.12*5+1.2*50 =0.6+60 =60.6

因为=1 所以 2/5+(3/5) =2/5×(5/2) =5/12×(12/5) =1

190×(2.1+2.9)=190×5=950 1.25×(75+12+13)=1.25×100=125

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