1..已知(x-y)^2=8,xy=2,求x^4+y^4!2.已知x+1/x=4,求(x-1/x)^2 还是第2题的题目,x^2+1/(x^2)等于多少?大哥哥大姐姐求求你们帮帮忙~
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![1..已知(x-y)^2=8,xy=2,求x^4+y^4!2.已知x+1/x=4,求(x-1/x)^2 还是第2题的题目,x^2+1/(x^2)等于多少?大哥哥大姐姐求求你们帮帮忙~](/uploads/image/z/2668775-23-5.jpg?t=1..%E5%B7%B2%E7%9F%A5%EF%BC%88x-y%29%5E2%3D8%2Cxy%3D2%2C%E6%B1%82x%5E4%2By%5E4%212.%E5%B7%B2%E7%9F%A5x%2B1%2Fx%3D4%2C%E6%B1%82%28x-1%2Fx%29%5E2+%E8%BF%98%E6%98%AF%E7%AC%AC2%E9%A2%98%E7%9A%84%E9%A2%98%E7%9B%AE%EF%BC%8Cx%5E2%2B1%2F%28x%5E2%29%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91%EF%BC%9F%E5%A4%A7%E5%93%A5%E5%93%A5%E5%A4%A7%E5%A7%90%E5%A7%90%E6%B1%82%E6%B1%82%E4%BD%A0%E4%BB%AC%E5%B8%AE%E5%B8%AE%E5%BF%99%7E)
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