x눀-3x+1=0求x눀+1⼀x눀 x+1⼀x=3求x눀⼀x的4次方+x눀+1

2024-12-19 21:58:20
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回答1:

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