Question

高手进啊已知乘法公式（a+b)(a^4-a^3b+a^2b^2-ab^3+b^4)=a^5+b^5,(a-b)(a^4+

Answer 1

令a=x^2 b=1

公式变为：

(x^2-1)(x^8+x^6+x^4+x^2+1)=x^5+1

x^8+x^6+x^4+x^2+1=(x^5+1)/(x^2-1)