已知p=(x²)/(x-y)-(y²)/(x-y)Q=(x+y)²-2y(x+y)小敏 小
已知p=(x²)/(x-y)-(y²)/(x-y)Q=(x+y)²-2y(x+y)小敏 小
已知P=x²/x-y-y²/x-y,Q=(x+y)²-2y(x+y),小红、小华两人在x=
2.(x+y)²(x-y)²-(x-y)(x+y)(x²+y²)
设P={y[y=-x²+1,x∈R}.Q={y[y=2^x,x∈R},则( )
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知:P=(x-y分之x^2)-(x-y分之y^2),Q=(x+y)^2-2y(x+y),小敏小聪两人在X=1,y=-1
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
已知2x-y=10,求代数式[(x²+y²)-(x-y)²+2y(x-y)]÷4y的值?
求因式分解(x-y)²-2(x-y)³和(x+y)(x-y)-x(x-y)
若|x+y-1|+(x-y-2)²=0,求代数式(x+2y)(x-2y)-(2x-y)(-y-2x)的值.
(x-2y)²+(2x-4y)(x+y)+(x+y)²
(x-y)的四次方(x-y)-2(x-y)²(y-x)³等于?