Question

3/1-x-5/7-x+x²-x/(x-1)(x-7)=1

Answer 1

化简后为 9x=-9

x=-1

3/1-x=-3/x-1 同理5/7-x=-5/x-7

同乘以（x-1)*(x-7)得 -3(x-7)+5(x-1)+(x^2 0-x=(x^2)-8x+7

乘开 合并同类项得 9x=-9

所以x=-1