已知（x+y)(x+y-2)+6=30,求x+y的值.

已知（x+y)(x+y-2)+6=30,求x+y的值. 已知X*X+Y*Y+6X-8Y+25=0 求（Y/X)+(X/Y)-2=? 已知：2x+y=6,x-3y=1 求7y(x-3y)(x-3y)-2(3y-x)(3y-x) 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 已知xy=-2,x-y=3,求（x+y)（x-y)-y^2+（x-y)^2-（6x^2y-2xy^2)÷2y 已知x^2+y^2+13-4x+6y=0,求(2x-y)^2-2(2x-y)(x+2y)+(x+2y)^2 已知x-y=3,求[（x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值 已知3x =2y 求x/x+y+y/x-y-y²/x²-y² 已知x+5y=6,求x(x+5y)+30y的值 已知x+2y=5 2x+y=6 则x-y= 已知(3x+y+6)²+|x+y+2|=2,则x=,y=. 已知x^2+2x+y^2-6y+10=0 求（x+y)^2 已知x+y=6,x-y=5,则x^2-y^2等于多少 已知x-2y=3,则(2x+y-6)/(3x-y-9)=? 已知x^2-y^2=6,x+y=3求x.y的值 已知x^2+y^2=12,x+y=6,求x、y的值. 已知x+y=-6,x-y=5,求x^2-y^2 已知:x^2-y^2=18,x+y=6,求x,y的值