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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

脱式运算怎样做 1.25×32+2.5×12.5+0.125×430 =1.25×32+25×1.25+1.25×43 =1.25×(32+25+43) =1.25×100 =125

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...

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

1

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

2.5✘1.6✘1.25 =5

如图

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