已知2x-5y=0,求分式(4x²-6xy+5y²)/(4x²+5y²)的值
已知x-5y=0,求分式x²-2xy+y²/3x+y × (y-x)的值
已知:x²+y²-4x-2y+5=0,求x+√xy分之(√x-√y)²+4√xy的值.
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知分式x²+3分之x-2y的值为0,求分式x²-y²分之x²-3xy-4y
已知,x-y=5,xy=6,求(x+y)²-2x-2y+1的值
已知x,y满足x²+y²+5/4=2x+y,求代数式xy/(x+y)的值.
已知x²+y²-2x+4y+5=0,求X^4-y^4/2x^2+xy-y²·2x-y/xy
已知1/x-1/y=3,求分式(4x-5xy-4y)/(3x-2xy-3y)的值
已知:x/y=4/5,求y²/(x²-xy+y²)的值
已知x-5y=0,求分式【(3x+y)/(x的2次方-2xy+y的2次方)】×(y-x)的值
已知x^2-xy-5y^2=0,求分式y/(x-y)-(x-y)/x的值
解一道分式题已知1/x-1/y=3 求分式(4x-5xy-4y)/(3x-2xy-3y)的值.