解题:X+X/1=3,求X²/x⁴+X²的值
问题描述:
解题:X+X/1=3,求X²/x⁴+X²的值
答
X+1/X=3
(X+1/X)² = 9
X²+1/X² +2 = 9
X²+1/X² = 7
X²/x⁴+ X²
= X²+1/X²
= 7