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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

2.5×1.25×32 =2.5×4×1.25×8 =10×10 =100

解:1.25*3.2*2.5 =1.25*(8*0.4)*2.5 =1.25*8*(0.4*2.5) =10*1 =10

①2.5×1.25×32 =2.5×1.25×(4×8)=(2.5×4)×(1.25×8)=10×10=100 ②51×2443+51×1943=51×(2443+1943)=51×1=51③318÷58-159×127=258×85-149×97=5-2=3④0.65×201-0.65=0.65×(201-1)=0.65×200=130

1

(1)480-48+124,=432+124,=556;(2)1.25×3.2×0.25,=(1.25×8)×(0.4×0.25),=10×0.1,=1;(3)( 7 23 + 1 3 )×3+ 2 23 ,= 7 23 × 3+ 1 3 × 3+ 2 23 ,=( 21 23 + 2 23 )+1,=1+1,=2;(4)( 2 3 - 2 5 )×30,= 2 3 × 30- 2 5 ...

2.5✘1.6✘1.25 =5

(1)1.25×9.76×80,=1.25×80×9.76,=100×9.76,=976;(2)3.2×2.5,=0.8×4×2.5,=0.8×(4×2.5),=0.8×10,=8;(3)23.6×99+23.6,=23.6×(99+1),=23.6×100,=2360;(4)36.7+63.3×2.4,=36.7+151.92,=188.62;(5)54.3÷4÷2.5,=54.3÷...

(1)(2.74+2.74+…+2.74共40个)×0.25,=2.74×40×0.25,=2.74×(40×0.25),=2.74×10,=27.4;(2)4.5×100.2,=4.5×(100+0.2),=4.5×100+0.9,=450+0.9,=450.9;(3)3.2×1.25×2.5,=4×0.8×1.25×2.5,=(0.8×1.25)×(4×2.5),=1×10,=10...

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