(x+y)(1-x-y)+6=0,则x+y的值是多少?解题思路.

（5x-6y)(x+y)=0(x不等于y),则y/x= 若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7 一元二次方程,(x+y)(1-y-x)+6=0,则√-(x+y)=? 若（x+y)(1-x-y)+6=0,则x+y的值是_____ (x+y)(1-x-y)+6=0,则x+y的值是多少?解题思路. (x+x)(1-x-y)+6=0,则(x+y)的值 已知4x+6y=1 若x=y 则x,y的值等于?若x+y=0 则x=?y=? 若实数X,Y满足X²+Y²+4X-2Y +1=0,则X²-6X+Y²-2Y的最大值是多少 若x+y=1,x不等于0则x+(2xy+y^2)/x/(x+y)/x= 已知x²+y²+6x-8x+25=0,求（x/x²-y² - 1/x+y）÷y/y-x {x+y=1 ,xy=-6{x(2x-3)=0,y=x²-1{(3x+4y-3)(3x+4y+3)=0,3x+2y=5{(x-y+2)(x+y)=0,x²+y²=8{(x+y)((x+y-1)=0,(x-y)(x-y-1)=0 (x+y)/6+(x-y)/10=1,(x+y)/6-(x-y)/10=5 {6/x+y+10/x-y=30 6/x+y-10/x-y=-1 若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 2(x+y)-3(x-y)=1 6(x+y)+(x-y)=51 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 {6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1 已知（x+5)+|y*y+y-6|=0,则y*y-5分之一xy+x*x+x*x*x=