x2-5x-1=0,求x4+1/x4的值x2-5x-1=0两边同时除以Xx-5-1/x=0x-1/x=5两边平方x2-2+1/x2=25x2+1/x2=27在两边平方x4+2+1/x4=729x4+1/x4=727自己已经解决了!有遇到这道题的朋友给你完美答案
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![x2-5x-1=0,求x4+1/x4的值x2-5x-1=0两边同时除以Xx-5-1/x=0x-1/x=5两边平方x2-2+1/x2=25x2+1/x2=27在两边平方x4+2+1/x4=729x4+1/x4=727自己已经解决了!有遇到这道题的朋友给你完美答案](/uploads/image/z/3764518-70-8.jpg?t=x2-5x-1%3D0%2C%E6%B1%82x4%2B1%2Fx4%E7%9A%84%E5%80%BCx2-5x-1%3D0%E4%B8%A4%E8%BE%B9%E5%90%8C%E6%97%B6%E9%99%A4%E4%BB%A5Xx-5-1%2Fx%3D0x-1%2Fx%3D5%E4%B8%A4%E8%BE%B9%E5%B9%B3%E6%96%B9x2-2%2B1%2Fx2%3D25x2%2B1%2Fx2%3D27%E5%9C%A8%E4%B8%A4%E8%BE%B9%E5%B9%B3%E6%96%B9x4%2B2%2B1%2Fx4%3D729x4%2B1%2Fx4%3D727%E8%87%AA%E5%B7%B1%E5%B7%B2%E7%BB%8F%E8%A7%A3%E5%86%B3%E4%BA%86%EF%BC%81%E6%9C%89%E9%81%87%E5%88%B0%E8%BF%99%E9%81%93%E9%A2%98%E7%9A%84%E6%9C%8B%E5%8F%8B%E7%BB%99%E4%BD%A0%E5%AE%8C%E7%BE%8E%E7%AD%94%E6%A1%88)
x2-5x-1=0,求x4+1/x4的值x2-5x-1=0两边同时除以Xx-5-1/x=0x-1/x=5两边平方x2-2+1/x2=25x2+1/x2=27在两边平方x4+2+1/x4=729x4+1/x4=727自己已经解决了!有遇到这道题的朋友给你完美答案
x2-5x-1=0,求x4+1/x4的值
x2-5x-1=0两边同时除以X
x-5-1/x=0
x-1/x=5两边平方
x2-2+1/x2=25
x2+1/x2=27在两边平方
x4+2+1/x4=729
x4+1/x4=727
自己已经解决了!有遇到这道题的朋友给你完美答案
x2-5x-1=0,求x4+1/x4的值x2-5x-1=0两边同时除以Xx-5-1/x=0x-1/x=5两边平方x2-2+1/x2=25x2+1/x2=27在两边平方x4+2+1/x4=729x4+1/x4=727自己已经解决了!有遇到这道题的朋友给你完美答案
x2-5x-1=0
显然x≠0
x-5-1/x=0
x-1/x=5
平方
x2+1/x2-2=25
x2+1/x2=27
平方
x4+1/x4+2=729
x4+1/x4=727
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