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  • 1 # 使用者3013958441215

    8x(25x15)

    =(4x2)x(25x15)

    =(4x25)x(2x15)

    =100x30

    =3000

    2. 5x4x5x20

    =5x5x4x20

    =25x4x20

    =100x20

    =2000

    3. 420/18

    =420/6/3

    =70/3

    4. 25x7x4x3

    =(25x4)x(7x3)

    =100x21

    =2100

    5. 15x32x25

    =15x(4x8)x25

    =(15x8)x(25x4)

    =120x100

    =12000

  • 2 # 使用者9339127914350

    8*(25*15)=(8*25)*15=200*15=3000,

    5*4*5*20=(5*4)*(5*20)=20*100=2000,

    420/18=420/6/3=70/3,

    25*7*4*3=(25*4)*(7*3)=100*21=2100,

    15*32*25=(15*8)*(4*25)=120*100=12000。

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