x^2+y^2+4x+6Y+13=0中xy是多少?
x^2+y^2+4x+6Y+13=0中xy是多少?
已知x^2+y^2-4x+6y+13=0求(xy+y^2/5x^2-5xy+xy+y^2)·(5/x+y)-(y/x-y
已知实数x、y满足x^2+4xy+4y^2+x+2y-6=0,求x+2y的平方根是多少?
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
2y+3x=2XY(X>0,Y>0)的XY的最小值是多少
已知X^2+Y^2+4X+6Y+13=0(X\Y为实数),则XY=_
已知实数xy满足x^2+y^2-6x+4y+13=0求x^y的值
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}
x^2y+4xy+4y
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*
已知13X^2-6XY+Y^2-4x+1=0,求(x+y)^13乘以x^10