4x²+8xy=y²+xy,求x:y=?
4x²+8xy=y²+xy,求x:y=?
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知X²+Y²+X²Y²-4XY+1=0 求:(X-Y)^2008-(XY)^2
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
已知x:y=3:2,求(x²+3xy)/(xy+2xy)
2x+y=0,求4x²+2xy(x+y)+y³
已知x²-y²=-8,xy=-3,求5x²-3xy+4y²+11xy-7x
已知x²+y²-2x+4y+5=0,求X^4-y^4/2x^2+xy-y²·2x-y/xy
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
已知x/y=3,求(x²+2xy-3xy²)/(x²-xy+y²)
已知x-xy=8,xy-y=-9,求x+y-2xy的值
已知x-y=根号5,xy=二分之一,求x²-xy+y²