数学香蕉

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数学香蕉
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数学香蕉
数学香蕉

数学香蕉

(1)
x+1/x=3
平方得
x²+1/x²+2=9
x²+1/x²=7
(2)
x²/(x⁴+x²+1)=1/(x²+1/x²+1)=1/(7+1)=1/8
(3)
∵0