已知x²+2xy-8y²=0(y≠0),求(x-y)/(x+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?
已知x-3y=0,求(x²-2xy+y²/x-y)-2y的值
已知x-3y=0,y≠0,求x²-2xy+y²分之2x+y×(x-y)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.
已知3x*+xy-2y*=0,求(x/y)-(y/x)-(x*+y*)/(xy)的值.*是平方
已知x-3y=0,求2x+y/x²-2xy ×(x-y)的值
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知,xy≠0,且3x²-2xy-8y²=0,求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+3xy-4y^2=0(y≠0),求x-y/x+y的值.
已知xy≠0,且3x²-2xy-8y²=0,求x/y+y/x的值
已知x平方+2xy-8y平方=0(y不等于0),求x-y/x+y的值