(1-x^3)\(1-x^2)=8\7
(1-x)(1+x+x^2)/[(1-x)(1+x)]=8/7
(1+x+x^2)/(1+x)=8/7
所以 7+7x+7x^2=8+8x
7x^2-x-1=0
x=[1±√29]/14
(呵呵!最后应该加一句) 经检验
x1=[1+√29]/14 x2=[1-√29]/14是原方程的根
(1-x^3)\(1-x^2)=8\7
(1-x)(1+x+x^2)/[(1-x)(1+x)]=8/7
(1+x+x^2)/(1+x)=8/7
所以 7+7x+7x^2=8+8x
7x^2-x-1=0
x=[1±√29]/14