Toán Lớp 9: Cho f(n)=\frac{5+3\sqrt{5}}{10}(\frac{1+\sqrt{5}}{2})^{n}+\frac{5-3\sqrt{5}}{10}(\frac{1-\sqrt{5}}{2})^{n} với n\in \ NN^{+}
Tính f(n+1)-f(n-1)
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Toán Lớp 9: Cho f(n)=\frac{5+3\sqrt{5}}{10}(\frac{1+\sqrt{5}}{2})^{n}+\frac{5-3\sqrt{5}}{10}(\frac{1-\sqrt{5}}{2})^{n} với n\in \ NN^{+}
Tính f(n+1)-f(n-1)
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