换元法:(x-3)/(x+1)+(x+1)/(x-3)=2

问题描述:

换元法:(x-3)/(x+1)+(x+1)/(x-3)=2

设y=x-3/x+1变为y+1/y=2.等号两边同乘y解得y=x-3/x+1=1但x-3/x+1=1无解,所以这个题无解