f(x+(1/x))= x^3+(1/x^3)= (x+(1/x))^3-3(x+(1/x)) 怎么化成这步的 --------------------------
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![f(x+(1/x))= x^3+(1/x^3)= (x+(1/x))^3-3(x+(1/x)) 怎么化成这步的 --------------------------](/uploads/image/z/6902604-36-4.jpg?t=f%28x%2B%281%2Fx%29%29%3D+x%5E3%2B%281%2Fx%5E3%29%3D+%28x%2B%281%2Fx%29%29%5E3-3%28x%2B%281%2Fx%29%29+%E6%80%8E%E4%B9%88%E5%8C%96%E6%88%90%E8%BF%99%E6%AD%A5%E7%9A%84+--------------------------)
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