已知x²-4xy+4y²=0,且xy≠0,那么x-y/x+y
已知x²-4xy+4y²=0,且xy≠0,那么x-y/x+y
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知x-y=4xy且xy≠0,求代数式-x-2xy+y分之2x+3xy-2y的值
已知X²+3XY-4Y²=0(Y≠0)求X-Y/X+Y
已知X²+Y²+X²Y²-4XY+1=0 求:(X-Y)^2008-(XY)^2
已知x²+y²-2x+4y+5=0,求X^4-y^4/2x^2+xy-y²·2x-y/xy
已知xy都是正实数且满足4x²+4xy+y²+2x+y-6=0则x(1-y)的最小值
已知,xy≠0,且3x²-2xy-8y²=0,求x/y的值
已知xy>0,证明xy+xy/1+x/y+y/x>=4
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-7y=0,且y≠0,求2x²﹢xy-3y²分之x²-3xy+y²的值
已知非零有理数x,y满足x²-4xy+4y²=0,求x-y/x+y-y-x/x+y的值.