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2.5×3.2×1.25用脱式计算

2.5×3.2×1.25 =(2.5×0.4)×(8×1.25) =10×10 =100

1.25x3.2x2.5 =1.25×8×0.4×2.5 =10×1 =10

2.5×1.25×32 =2.5×4×1.25×8 =10×10 =100

原式=0.25*4*0.8*1.25=1*1=1

(1)1.25×0.25×3.2×1.7,=1.25×0.25×(0.8×4)×1.7,=(1.25×0.8)×(0.25×4)×1.7,=1×1×1.7,=1.7;(2)1.3-3.79+9.7-6.21,=1.3+9.7-3.79-6.21,=(1.3+9.7)-(3.79+6.21),=11-10,=1;(3)6×14+13÷4-11×25%,=6×14+13×14-11×14,=(6+...

(1)1.25×3.2×8=1.25×8×3.2=10×3.2=32;(2)0.45×6.2+3.8×0.45=0.45×(6.2+3.8)=0.45×10=4.5;(3)2.7×9.9=2.7×(10-0.1)=2.7×10-2.7×0.1=27-0.27=26.73;(4)15×10.2=15×(10+0.2)=15×10+15×0.2=150+3=153;(5)0.25×[(2.8+4.4)÷1.2]...

8.56-1.56x0.5 =7+1.56-1.56x0.5 =7+1.56x(1-0.5) =7+1.56x0.5 =7+0.78 =7.78 1.25x3.2x2.5 =1.25x(8x0.4)x2.5 =(1.25x8)x(0.4x2.5) =10x1 =10

解:原式=1.25×0.8×0.32 =1×0.32 =0.32 望采纳

(1)0.25×1.25×4×8,=(0.25×4)×(1.25×8),=1×10,=10;(2)2.125×14+1.875÷4,=(2.125+1.875)×14,=4×14,=1;(3)(2.5-0.125)×0.8+6.24,=2.5×0.8-0.125×0.8+6.24,=2-0.1+6.24,=8.14,(4)2÷23-23÷2,=2×32-23×12,=3-13,=223;...

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