甲数是20,乙数是40.(1)甲数是乙数的百分之几?(2)乙数是甲数的百分之几?(3)甲数比乙数少百分之几?(4)乙数比

3个回答

  • (1)

    20÷40×100%

    =0.5×100%

    =50%

    (2)

    40÷20×100%

    =2×100%

    =200%

    (3)

    ﹙40-20﹚÷40×100%

    =20÷40×100%

    =0.5×100%

    =50%

    (4)

    ﹙40-20﹚÷20×100%

    =20÷20×100%

    =1×100%

    =100%