若(x+2)²+|y+2/3|=0,求2x-3y+5的值

若x-y/x+y=5,求x-y/2x+2y+5x+5y/3x-3y的值 (1)已知x+y=6,x²-y²=5,求x-y的值（2）若x+y=3,x²+y² |x+y+2|+(2x+3y+5)²＝0 求x y的值. 已知y-2x=0,求3x²-2y²/(x+y)(x-y)的值 若（3x-y+5）²+√2x-y+3=0,求x-y的值 若X,Y互为相反数,且(X+Y+3)(X-Y-2)=0,求X,Y的值? 若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值 若x^5+x^4y+x^4+x+y+1=0,且3x+2y=1,求x,y的值 若|x+y-1|+（x-y-2)²=0,求代数式（x+2y)(x-2y）-（2x-y)(-y-2x)的值. 若|5x-2y-3|+(x+6y-11)X(x+6y-11)=0成立,求x,y的值, 已知x-3y=0,求(x²-2xy+y²/x-y)-2y的值 已知x-3y=0(y≠0)求2x+5y/3x-2y的值