X⒉+Y⒉-4X+8Y+20=0 求X+Y=?
已知x的平方+y的平方-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
已知x.x+y.y+8x+6y+25=0,求代数式(x.x-4y.y)/(x.x+4xy+4y.y)-x/(x+2y)的
x平方+4ax+y平方-8y+20=0 求x+y的值
已知x²+y²+8x+6y+25=0,求x-4y/x+y的值
已知x²+4y²-6x+8y+13=0,求x-y/x+y的值.
已知x^2+4y^2-4x+8y+8=0,求x+y
已知方程组4x+2y=1,20x+8y,求x,y
若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*
y满足x^2+y^2-4x-2y+5=0求根号下8y-2x分之根号下x+y(不包括+y)
已知:4x = 5y,求(x+y) :y