125分之88*126= 2012分之2011*2011= 计算9*8分之7时()的计算方法简便

1个回答

  • 125分之88*126

    = 88/125x(125+1)

    = 88/125x125+88/125

    =88+88/125

    =88又125分之88

    (2)

    2012分之2011*2011

    =2011/2012x(2012-1)

    =2011/2012x2012-1x2011/2012

    =2011-2011/2012

    =2010又2012分之1

    (3)

    1:(10-1)*8分之7

    =1/9x7/8

    =7/72 (72分之7)

    (4)

    2:(8+1)*8分之7

    =2/9x7/8

    =7/36 (36分之7)

    (5)

    3:8分之9*7

    =3*8/9*7

    =56/3 (3分之56)