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2.5×1.25×32脱式计算

2.5×1.25×32 =2.5×4×1.25×8 =10×10 =100

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

1.25x32 =1.25x8x4 =10x4 =40

(1) 5 9 ×{1÷( 7 8 - 3 4 )}= 5 9 ×{1÷( 21 24 - 18 24 )}= 5 9 ×{1÷ 1 8 }= 5 9 ×8=4 4 9 ;(2)1.25×32×2.5=(1.25×8)×(4×25)=10×100=1000;(3)(3.8-1.8÷2)×0.5=(3.8-0.9)×0.5=2.9×0.5=1.45;(4) 7 15 ×9-6÷ 15 7 = 7 15 ×...

32X0.25X1.25脱式计算 32X0.25X1.25 =(0.25*4)*(1.25*8) =1*10 =10

(1)16-65+8.4-45,=16-1.2+8.4-0.8,=(16+8.4)-(1.2+0.8),=24.4-2,=22.4;(2)1.25×32×2.5,=1.25×8×4×2.5,=(1.25×8)×(4×2.5),=10×10,=100;(3)2345×19+23×2645,=2345×19+2345×26,=2345×(19+26),=2345×45,=23;(4)82×...

1. 4×102-2×49 =408-2×49 =408-98 =310 2. 25×(2+4) =25×2+25×4 =50+100 =150 3. 12×5+8 =60+8 =68 4. 99×101 =99×(100+1) =99×100+99×1 =9900+99 =9999 5. 25×(78×4) =25×4×78 =100×78 =7800 6. (25+12)×4 =25×4+12×4 =100+48 =148 7. ...

(1.25十1.2)x8 =1.25×8+1.2×8 =10+9.6 =19.6

(1)19.8×0.54÷0.081,=10.692÷0.081,=132;(2)0.25×32×1.25,=0.25×(4×8)×1.25,=(0.25×4)×(1.25×8),=1×10,=10;(3)1.89÷0.54-7.1÷2.5,=3.5-2.84,=0.66;(4)0.25×26×40,=0.25×40×26,=10×26,=260;(5)8.7×99,=8.7×(100...

(1)4.5×5.2+4.5×4.8=4.5×(5.2+4.8)=4.5×10=45;(2)8.8×1.25=(8+0.8)×1.25=8×1.25+0.8×1.25=10+1=11;(3)0.4×(4.3×2.5)=4.3×(0.4×2.5)=4.3×1=4.3;(4)60.8-1.75-1.25=60.8-(1.75+1.25)=60.8-3=57.8;(5)0.4×(4.3×2.5)=4.3×...

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