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2.5乘0.32乘1.25,脱式计算能简算的要简算

1

1.25x32 =1.25x8x4 =10x4 =40

1.25×0.4×80×2.5 =(1.25×80)×(2.5×0.4) =100×1 =100

解:采用结合律, 原式=3.73÷2.5÷0.4 =3.73÷(2.5x0.4) =3.73÷1 =3.73

(1)0.6+6×32×0.25,=0.6+(6×8)×(4×0.25),=0.6+48×1,=0.6+48,=48.6;(2) ( 4 5 + 1 4 ) ÷ 7 3 - 1 4 ,= 21 20 × 3 7 - 1 4 ,= 9 20 - 1 4 ,= 1 5 ;(3)36×( 7 9 + 1 4 - 5 6 ),=36× 7 9 +36× 1 4 -36× 5 6 ,=28+9-30,=7;...

4.8×2.5 =(4.8÷4)×(2.5×4) =1.2×10 =12

2.5x7.5x40 =2.5x40x7.5 =100x7.5 =750

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

=1.25×0.8×2/3×1/2=1×1/3=1/3

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...

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