已知m/x^2--y^2=2xy--y^2/x^2--y^2=x-y/x+y则m=?
问题描述:
已知m/x^2--y^2=2xy--y^2/x^2--y^2=x-y/x+y则m=?
答
不知
答
楼主题错了吧?应该是M/x^2-y^2=2xy-y^2/x^2-y^2+x-y/x+y,则M=右边=(2xy-y²)/(x²-y²)+(x-y)²/(x+y)(x-y)=(2xy-y²+x²-2xy+y²)/(x²-y²)=x²/(x²-y²)所以M=...