若4x^2+|x-6|+9y^2=12xy,则x+y= 若4x^2+|x-6|+9y^2=12xy,则x+y=

若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7 计算：1.y/4x²-1/12y²+1/6xy 2.3/x-6/1-x-x+5/x²-x3.x/x-y×y²/x+y-x四次方y/x四次方-y四次方÷x²/x²+y²解方程：1.x-1/（x-2）+1=1/2-x2.x+1/x-1-4/x²-1=13.1/x+3-2/3-x=1/x²-9 若2x^2-6xy+9y^2-4x+4=0,则y/x-x/y=若2x^2-6xy+9y^2-4x+4=0,则y/x-x/y=? xy²/(x²y-y) × x²/(x²+x)=(x²-3x)/(x²-5x) × 2x-10/(x²-6x+9)=化简求植x²-1/(x²-x-2)除以x/2x-4,其中x=1/2[x-x/(x+1)]除以[x/(2x-4)] ,其中x=√2+1 已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值 在4x^2+12x+|2y-6|=-9的条件下,x^y= 81/8*(-x-y)^6*(x-y)^3*4/9(x+y)^4*(y-x)^2 （x+y）/2- x-y/2=6 3(x+y)=4(x-y) x+y/3+x-y/2=6 4(x+y)-2(x-y)=40 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11 3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9 若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20 {(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20 4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6 9(x-y)^2-12(x-y)+4=快 因式分解：4+12(x+y)+9(x-y)^2=?