125x25x8x42简便用算

125*25*8*4=(125*8)*(25*4)=1000*100=100000

(125x25)x8=125x25x8=125x8x25=1000x25=25000

125x4x8x25简便计算 =(125x8)x(4x25) =1000x100 =100000

4x125x25x5x8x20x2 =125x8x(4x25)x(20x5)x2 =1000x100x100x2 =2000x10000 =20000000

125x25x4x8=(125x2)x4x(25x4)=250x4x100=1000x100=100000

=(125*4)*(25*4) =500*100 =50000

125x25x4x4用简便计算=(125x4)x(25x4)=500x100=50000

1.25x25x8x12 =(1.25x8)x25x12=10x(25x4)x3=10x100x3=3000

12x8x125x25=(12x25)x(8x125)=300x1000=300000

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