|2x+1|+|3y-2|=0,求x,y的值

(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5) 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 求导数y=3x-x^2 求y',y'/ x=1 y'/x=0 {(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=? 3x+4y-5=0 x^2+y^2=1求x.y 已知|2x-3y|+|3x-y-1|=0,求x,y的值. 已知2x-y=0,求分式【1+（3*y*y*y/x*x*x-y*y*y）】/【1+（2y/x-y）】的值注：x*x*x-y*y*y=（x-y）*（x*x+xy+y*y） 已知X,Y满足|X-Y-1|+（X+Y-3)^2=0求X,Y的值 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 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)]除以y的值大神们帮帮忙 已知x-y=1,求[(x+2y)²+(2x+y)(x-4y)-3(x+y)(x-y)]÷y的值 若(2x-y-1)2+|x-2y-3|=0,求代数式(2x+y)(2x-y)-(x+2y)(x-2y-1)的值若(2x-y-1)²+|x-2y-3|=0,求代数式(2x+y)(2x-y)-(x+2y)(x-2y-1)的值 x²-4x-1=0,求(2x-3)²-(x+y)(x-y)-y² 已知x-y=3,求[（x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值 已知|3x+y-0.5|+(x+2y+1.5)^2=0,求代数式（x-y)(x-2y)-3x(1/3x-y)+(2x+y)(2x-y) 快. 已知3x =2y 求x/x+y+y/x-y-y²/x²-y² 已知:x-2y+3=0 求x^2-(4y+1)x+4y^2+2y