已知 x-3y=0 求(2x+y)/(x²-2xy+y²)*(x-y)
2x²-3xy=y²=0(x,y不得o)求x/y+y/x
已知x-3y=0,y≠0,求x²-2xy+y²分之2x+y×(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2x+y=0,求x-2y/x²+xy*(x²-y²)/x²-4xy+4y
已知(x+3)+丨X-y+10丨=0 ,求5x²y-[2x²y-(3xy-xy²)-3x&
已知(x+2)^2+|x+y+5|=0,求3x^2y-[2x^2y-(2xy-x^2y)-4x^2]-xy
已知X²+3XY-4Y²=0(Y≠0)求X-Y/X+Y
已知 x-3y=0 求(2x+y)/(x²-2xy+y²)*(x-y)
已知x-5y=0,求分式x²-2xy+y²/3x+y × (y-x)的值
已知xy=2,x-y=3,求(x+y)(x-y)-y^2-(6x^2y-2xy^2)/2y的值.
已知xy=-2,x-y=3,求(x+y)(x-y)-y平方+(x-y)平方-(6x2y-2xy平方)/2y的值
已知x/2=y/3(xy≠0),求x²-2xy-3y²/x²-6xy-7y²的值