若x+y=10,xy=24,则x²+y²=?(x-y)²=?
若x+y=10,xy=24,则x²+y²=?(x-y)²=?
若x+y=10 xy=-1 则x²+y²=(x+y)²-2xy=
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知有理数x,y满足xy=4,x+y=7,则x²y+xy²=()?
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
若x-y=1,xy=5,则x²y-xy²=?
已知x+y=1,xy=-二分之一,求x(x+y)(x-y)-x(x+y)²
2x²-3xy=y²=0(x,y不得o)求x/y+y/x
若正数x,y满足x²-y²=2xy,求(x-y)/(x+y)的值
x²+xy/(x-4y)(x+y),其中x=4,y=-1
已知2x-y=10,求式子[(x^2+y^2)-(x-y)^2+2y(x-y)]/4y (4xy-2y²)/4
若m/x²-y²=2xy-y²/x²-y²+x-y/x+y,则m的值为