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脱式计算能简算的要简算2.5×1.6×1.25

2.5✘1.6✘1.25 =5

2.5×1.6×1.25 =2.5x(1+0.6)x1.25 =(2.5+2.5x0.6)x1.25 =(2.5+1.5)x1.25 =4x1.25 =5

①1.25×4.8,=1.25×8×0.6,=10×0.6,=6; ②5.5×9.9+0.1×5.5,=(9.9+0.1)×5.5,=10×5.5,=55; ③3.45×102,=3.45×(100+2),=3.45×100+3.45×2,=345+6.9,=351.9;④3.17+0.83×1.6,=3.17+1.328,=4.498.

(1)8×0.4×1.25×2.5,=(8×1.25)×(0.4×2.5),=10×1,=10;(2)72×99,=72×(100-1),=7200-72,=7128;(3)24×(13-18),=24×13-24×18,=8-3,=5;(4)27.4-52.8÷(1.9+2.1),=27.4-52.8÷4,=27.4-13.2,=14.2.

(1)13÷0.4÷2.5,=13÷(0.4×2.5),=13÷1,=13;(2)64×4.5+36×4.5,=(64+36)×4.5,=100×4.5,=450;(3)1.25×2.5×0.8,=1.25×0.8×2.5,=1×2.5,=2.5;(4)1.5×101-1.5,=1.5×(101-1),=1.5×100,=150;(5)14.64+3.7×2.8,=14.64+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×...

①2.5×1.25×32,=2.5×1.25×4×8,=(2.5×4)×(1.25×8),=10×10,=100;② 5 11 × 2 7 + 6 7 × 2 11 ,= 5 11 × 2 7 + 2 7 × 6 11 ,=( 5 11 + 6 11 )× 2 7 ,=1× 2 7 ,= 2 7 ;③ 2006 2007 ×2008 ,= 2006 2007 ×(2007+1),= 2006 2007 ×20...

0.4×125×25×0.8 =(0.4×25)×(125×0.8) =10×100=1000 1.25×(8+10) =1.25×8+1.25×10 =10+12.5=22.5 9123-(123+8.8) =9123-123-8.8 =9000-8.8 =8991.2 1.24×8.3+8.3×1.76 =8.3×(1.24+1.76) =8.3×3=24.9 9999×1001 =9999×(1000+1) =9999×...

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

1.25×8点八 =12.5×8×1.1 =100×1.1 =110

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