x²-3x+1=0求根号x²+1/x²-2是数学八年纪下二次根式的运算
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![x²-3x+1=0求根号x²+1/x²-2是数学八年纪下二次根式的运算](/uploads/image/z/3758713-25-3.jpg?t=x%26%23178%3B-3x%2B1%3D0%E6%B1%82%E6%A0%B9%E5%8F%B7x%26%23178%3B%2B1%2Fx%26%23178%3B-2%E6%98%AF%E6%95%B0%E5%AD%A6%E5%85%AB%E5%B9%B4%E7%BA%AA%E4%B8%8B%E4%BA%8C%E6%AC%A1%E6%A0%B9%E5%BC%8F%E7%9A%84%E8%BF%90%E7%AE%97)
x²-3x+1=0求根号x²+1/x²-2是数学八年纪下二次根式的运算
x²-3x+1=0求根号x²+1/x²-2
是数学八年纪下二次根式的运算
x²-3x+1=0求根号x²+1/x²-2是数学八年纪下二次根式的运算
x²-3x+1=0
x≠0
两边除以x得
x+1/x=3
根号x²+1/x²-2
=√[(x+1/x)^2-4]
=√5
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