8/(X—Y)+48/(X+Y)=10 24/(X+y)+14/(x—y)=10 仔细分步解决,谢谢

3个回答

  • 8/(X—Y)+48/(X+Y)=10

    分子分母同乘以(x+y)(x-y)

    8(x+y)+48(x-y)=10(x+y)(x-y)

    56x-40y=10x^2-10y^2

    24/(X+y)+14/(x—y)=10

    分子分母同乘以(x+y)(x-y)

    24(x-y)+14(x+y)=10(x+y)(x-y)

    38x-10y=10x^2-10y^2

    56x-40y=38x-10y

    18x=30y

    x=5/3y

    代入上式得

    56x-40y=10x^2-10y^2

    56X5/3y-40y=10(5/3y)^2-10y^2

    160/3y=160/9y^2

    3y=y^2

    y=0或者y=3

    当y=0时x=0

    根据题目,x+y和x-y不能等于0

    所以y=3

    x=5