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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

2.5✘1.6✘1.25 =5

解:原式=1.25×0.8×0.32 =1×0.32 =0.32 望采纳

0.28×(11-1)=0.28×10=2.8 7+1.56-1.56×0.5=7+1.56×(1-0.5)=7+1.56×0.5=7+0.78=7.78 1.25×3.2×2.5=1.25×8×0.4×2.5=10×1=10

(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;...

(1)0.76×5.8+0.76×4.2,=0.76×(5.8+4.2),=0.76×10,=7.6;(2)1.25×13.7×8,=(1.25×8)×13.7,=10×13.7,=137;(3)10-6.8-3.2,=10--(6.8+3.2)=10-10,=0;(4)5.81+8.3+4.19+11.7,=(5.81+4.19)+(8.3+11.7),=10+20,=30;(5...

(1)32×0.16×2.5×1.25,=8×4×0.16×2.5×1.25,=(8×1.25)×(4×2.5)×0.16,=10×10×0.16,=100×0.16,=16;(2)6.4×4.2-4.2×25,=4.2×(6.4-0.4),=4.2×6,=25.2;(3)(0.3+15)×1.6-45,=0.5×1.6-0.8,=0.8-0.8,=0;(4)9÷[1-(25+920)]...

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