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2.1*12.5*4.8简便算

2.1×(12.5×4)×1.2=2.1×60=126

2.1×12.5×4.8 =2.1×(12.5×4+12.5×0.8) =2.1×(50+10) =2.1×60 =2×60+0.1×60 =120+6 =126

1.25×0.7+1.25×1.2+12.5=1.25x(0.7+1.2+10)=1.25x11.9=1.25x12-1.25x0.1=1.25x4x3-0.125=5x3-0.125=15-0.125=14.875 简便计算是一种特殊的计算,它运用了运算定律与数字的基本性质,从而使计算简便,使一个很复杂的式子变得很容易计算出得数。 ...

7.5x2.3+1.9x2.5+12.5x0.4 =2.5x3x2.3+1.9x2.5+2.5x5x0.4 =2.5x(6.9+1.9+2) =2.5x10.8 =2.5x(10+0.8) =2.5x10+2.5x0.8 =25+2 =27

1.25*0.7 +1.25*1.2 +12.5的简便 =1.25x(0.7+1.2)+12.5 =1.25x1.9+12.5 =1.25x2-1.25x0.1+12.5 =2.5+12.5-0.125 =15-0.125 =14.875

=1.2×(4.8+5) =1.2×9.8 =1.2×(10-0.2) =12-0.24 =11.76 确定

12.5x1.2-12.5 =12.5x(1.2-1) =12.5x0.2 =0.25

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

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

12x(3/4-1/2+5/6) =12x3/4-12x1/2+12x5/6 =9-6+10 =13

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