已知x²-12xy-28y²=0(x≠0,y≠0),求(2x+3y)/28
已知X²+3XY-4Y²=0(Y≠0)求X-Y/X+Y
已知x-3y=0,y≠0,求x²-2xy+y²分之2x+y×(x-y)的值
已知x-7y=0,且y≠0,求2x²﹢xy-3y²分之x²-3xy+y²的值
已知x/2=y/3(xy≠0),求x²-2xy-3y²/x²-6xy-7y²的值
已知3x²+xy-2y²=0(x≠0,y≠0),求x/y-y/x-x²+y²/x
已知xy≠0,且2x+3xy-2y=0,求(x+y)/(x-y)的值.
已知x^2+3xy-4y^2=0(y≠0),求x-y/x+y的值.
已知x-3y=0,求(x²-2xy+y²/x-y)-2y的值
已知,xy≠0,且3x²-2xy-8y²=0,求x/y的值
已知x-3y=0,求2x+y/x²-2xy ×(x-y)的值
已知实数x,y满足x²+y²-xy+2x-y+1=0 求x y
已知3x*+xy-2y*=0,求(x/y)-(y/x)-(x*+y*)/(xy)的值.*是平方