|x+y+2|+(2x+3y+5)²=0 求x y的值.
|x+y+2|+(2x+3y+5)²=0 求x y的值.
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
已知y-2x=0,求3x²-2y²/(x+y)(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x-y/x+y=5,求x-y/2x+2y+5x+5y/3x-3y的值
已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
(1)已知x+y=6,x²-y²=5,求x-y的值(2)若x+y=3,x²+y²
已知x^3+xy^2+x+x^2y+y^3+y=0,求5x-6y/3x+4y的值.
已知x,y的值满足方程组x+2y=3,x-y=-2,求x/(x-y)²+x²-y²/(x+
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