数学问题:计算(x+1⼀x)(x^2+1⼀x^2)(x^4+1⼀x^4)(x^2-1)

计算这道题。。用简便的方法吖。。谢啦~
2024-12-13 11:56:11
推荐回答(3个)
回答1:

(x^+1)(x^4+1)(x^8+1)(x^-1)/x^7=(x^16+1)/x^7
通分,反复用平方差公式

回答2:

(x+1/x)(x^2+1/x^2)(x^4+1/x^4)(x^2-1)
=(x-1/x)(x+1/x)(x^2+1/x^2)(x^4+1/x^4)(x^2-1)/(x-1/x)
=(x^2-1/x^2)(x^2+1/x^2)(x^4+1/x^4)(x^2-1)/(x-1/x)
=(x^4-1/x^4)(x^4+1/x^4)(x^2-1)/[(x^2-1)/x]
=(x^8-1/x^8)x
=x^9-1/x^7

回答3:

(x^8-1/x^8)