已知X+3Y-1=0,求8X-7Y-4X+10Y-5的值

已知(3x+1)(3x-3)-3x+2)^2=-7,(y+7)(y-7)-y(y-7)=0,求8y^2-5y(-y+3x)+4y(-4y-5/2x)的值 已知:3x-5y=0,求x/y,x-y/y,x-y/x 已知X+3Y-1=0,求8X-7Y-4X+10Y-5的值 已知实数x.y满足根号(x+y-8)+根号(8-x-y)=根号(3x-y-4)+根号(x-2y+7),求x,y 已知7x+5y/2y-x=3/2,且x≠0,求X/x-4y 已知x^2-8x+y^2-y+16又1/4=0,求[(x+y)(x-y)-(x+y)^2-2y(x-3y)]÷4y的值 1 已知x+y/y=7/3 求x+y/x-y等于什么2 若x+4/3=y+3/2=z+8/4 且x+y+z=12 求x、y、z的值 已知x+y=3,xy=2,求x^2+y^2的值 已知x^2-4=0,求代数式x(x+1)^2-x(已知x+y=3,xy=2,求x^2+y^2的值已知x^2-4=0,求代数式x(x+1)^2-x(x^2+x)-x-7的值 已知：2x+y=6,x-3y=1 求7y(x-3y)(x-3y)-2(3y-x)(3y-x) 已知x-y=1,求[(x+2y)²+(2x+y)(x-4y)-3(x+y)(x-y)]÷y的值 已知x-y=1,求[(x+2y)^2+(2x+y)(x-4y)-3(x+y)(x-y)]除以y的值大神们帮帮忙 已知x求^2+y^2-6x-8y+25=0求1/x-y /x+y/x^4-y^4 已知|X-8Y|+2(4Y-1)^2+3|8Z-3X|=0求X+Y+Z 已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值 1、已知x/y=7/2,求x/x+y 2、已知x/2=y/3=z/4,求x+y+z/2x+3y-z!1、已知x/y=7/2,求x/x+y2、已知x/2=y/3=z/4,求x+y+z/2x+3y-z! 已知|3x-y|+|x+y|=0,求x-y除以x*y的值. 已知3X-4Y-Z=0,2X+Y-8Z=0.求：（1）X+2Y-7Y的值. 已知x、y满足2/1|x-y|+|1-y|=0,求7x-3y的值