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2.1*12.5*4.8简便算

2.1×(12.5×4)×1.2=2.1×60=126

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

(1)26.7+3.3×1.2+0.04=26.7+3.96+0.04,=26.7+(3.96+0.04),=26.7+4,=30.7;(2)4.8×12.5×0.8=0.8×12.5×4.8,=10×4.8,=48;(3)2.5×(6+9.728÷3.2)=2.5×(6+3.04),=2.5×9.04,=2.5×(10-0.06),=2.5×10-2.5×0.06,=25-0.15,=24.85...

先用减法的性质去括号。再用加法结合律。 7/12-﹙1/4-5/12﹚ =7/12-1/4+5/12 =7/12+5/12-1/4 =1-1/4 =3/4,等于4分之3

12.5*(7+12+1)=12.5*20=250

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

=(2.5x4)x9x(12.5x8) =10x9x100 =9000 1/2÷[1-(3/9+5/9)] =1/2÷1/9 =9/2 =4.5

用计算机

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

1/2+1/3+1/4+1/5+1/6+1/12+1/30 =1/2+1/3+1/4+1/5+1/6+1/3-1/4+1/5-1/6 =1/2+1/3+1/5+1/3+1/5 =1/2+2/3+2/5 =47/30 =1又17/30

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