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2.5X1.9X0.4的简便计算

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

=2/5x(1/10+9/10)=2/5x1=2/5

(2.5x6.7+1.9x2.5)x0.4 =[2.5x(6.7+1.9)]x0.4 =2.5x8.6x0.4 =8.6x1 =8.6

2.5x3.8x0.4x0.2 =(2.5x0.4)x(3.8x0.2) =1x0.76 =0.76 6.5xl.9一6.5x0.9 =6.5x(1.9-0.9) =6.5x1 =6.5 2.7X10.2 =2.7x10+2.7x0.2 =27+0.54 =27.54 9.8X25 =10x25-0.2x25 =250-5 =245 供参考。

2.5×27×0.4 =(2.5x0.4)x27 =1x27 =27; 4.85-(2.1+0.85) =(4.85-0.85)-2.1 =4-2.1 =1.9; 3.2-2.8+6.8-7.2 =(3.2+6.8)-(2.8+7.2) =10-10 =0; 777×9+111×37 =111x7x9+111x37 =111x63+111x37 =111x(63+37) =111x100 =11100. 供参考。

=10.1x9.4-10x9.4 =9.4x(10.1-10) =9.4x0.1 =0.94

(1)9.81X9.8=9.81*(10-0.2)=9.81*10-9.81*0.2=98.1- 1.962=96.138 (2)0.027+9.9X0.27=0.027*(1+99)=2.7 (3)感觉这个已经很简便了小朋友,13.4-0.4X3=13.4-1.2=12.2

1.72+0.53+0.28+1.47 =(1.72+0.28)+(0.53+1.47) =2+2 =4 3.2×1.25×2.5 =4×0.8×1.25×2.5 =(4×2.5)×(0.8×1.25) =10×1 =10 3.9×99 =3.9×(100-1) =3.9×100-3.9×1 =390-3.9 =386.1

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