⑴已知x+1/x=3,求x²+1/x².x²+1/x²=(x+1/x)²-2=9-2=7.⑵借鉴上题的解法求解 已知x²-5x+1=0,求x-1/x的值
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![⑴已知x+1/x=3,求x²+1/x².x²+1/x²=(x+1/x)²-2=9-2=7.⑵借鉴上题的解法求解 已知x²-5x+1=0,求x-1/x的值](/uploads/image/z/1092537-9-7.jpg?t=%E2%91%B4%E5%B7%B2%E7%9F%A5x%EF%BC%8B1%2Fx%EF%BC%9D3%2C%E6%B1%82x%26%23178%3B%EF%BC%8B1%2Fx%26%23178%3B.x%26%23178%3B%EF%BC%8B1%2Fx%26%23178%3B%EF%BC%9D%EF%BC%88x%EF%BC%8B1%2Fx%EF%BC%89%26%23178%3B%EF%BC%8D2%EF%BC%9D9%EF%BC%8D2%EF%BC%9D7.%E2%91%B5%E5%80%9F%E9%89%B4%E4%B8%8A%E9%A2%98%E7%9A%84%E8%A7%A3%E6%B3%95%E6%B1%82%E8%A7%A3+%E5%B7%B2%E7%9F%A5x%26%23178%3B%EF%BC%8D5x%EF%BC%8B1%EF%BC%9D0%2C%E6%B1%82x%EF%BC%8D1%2Fx%E7%9A%84%E5%80%BC)
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⑴已知x+1/x=3,求x²+1/x².x²+1/x²=(x+1/x)²-2=9-2=7.⑵借鉴上题的解法求解 已知x²-5x+1=0,求x-1/x的值
⑴已知x+1/x=3,求x²+1/x².x²+1/x²=(x+1/x)²-2=9-2=7.⑵借鉴上题的解法求解 已知x²-5x+1=0,求x-1/x的值
⑴已知x+1/x=3,求x²+1/x².x²+1/x²=(x+1/x)²-2=9-2=7.⑵借鉴上题的解法求解 已知x²-5x+1=0,求x-1/x的值