已知P=x²/x-y-y²/x-y,Q=(x+y)²-2y(x+y),小红、小华两人在x=
已知P=x²/x-y-y²/x-y,Q=(x+y)²-2y(x+y),小红、小华两人在x=
数学题已知p=x^/x-y-y^/x-y,q=(x+y)^-2Y(X+Y),
已知p=(x²)/(x-y)-(y²)/(x-y)Q=(x+y)²-2y(x+y)小敏 小
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
已知P=X+Y,Q=(X-Y)(X-Y)-2Y(X+Y).小敏、小聪两人在X=2,Y=-1的条件下分别计算了P和Q的值.
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y
已知P=x-y分之x平方-x-y分之y平方,Q=(x+y)平方-2y(x+y)小敏小聪两人在X=2,y=-1分别计算P和
已知x+y=1,xy=-二分之一,求x(x+y)(x-y)-x(x+y)²
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(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
已知x,y的值满足方程组x+2y=3,x-y=-2,求x/(x-y)²+x²-y²/(x+