x눀-3x+1=0求x눀+1⼀x눀 x+1⼀x=3求x눀⼀x的4次方+x눀+1
推荐回答（1个）
你好
x²-3x+1=0
同除x，移项得
x+1/x=3
x²+1/x²=（x+1/x）²-2x*1/x=9-2=7
x²/（x⁴+x²+1）
=1/（x²+1+1/x²）
=1/（7+1）
=1/8
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