(a8-b8)÷(a4+b4)÷(a2+b2)

问题描述:

(a8-b8)÷(a4+b4)÷(a2+b2

(a8-b8)÷(a4+b4)÷(a2+b2
=(a-b)(a+b)(a2+b2)(a4+b4)÷(a4+b4)÷(a2+b2
=(a-b)(a+b)