已知|5x-y-8|+(7y-x+2)=0则4x+6y

已知|5x-y-8|+(7y-x+2)=0则4x+6y 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 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7Y=X-3,8Y=X+5 求X和Y 已知|x-2y|+|5x-7y-2|则,x = y= 已知(x-y)^2+|5x-7y-2|=0,求x,y的值. 已知2x-y=-3,求代数式5(x-3y)-2(x-7y) 已知{2x+y=7,x+2y=8,则x-y=?x+y=? 已知方程组{2x+y=7,x+2y=8,则x-y=(),x+y=(). 已知X*X+Y*Y+6X-8Y+25=0 求（Y/X)+(X/Y)-2=? 已知x-2y=2016,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除以8x的值 已知x-2y=2012,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]/(8x)) 已知x-2y=2010,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷8x的值 已知:x-2y=2009,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除以8x 的值 已知x*x+4x+y*y-2y+5=0,则x*x+y*y=? 已知:3x-5y=0,求x/y,x-y/y,x-y/x 已知7x+5y/2y-x=3/2,且x≠0,求X/x-4y