Show that 55+55+5\displaystyle \frac{5\sqrt{5} + 5}{5 + \sqrt{5}}5+555+5 can be written as 5\sqrt{5}5
Hence, simplify (55+55+5)3\displaystyle \left(\frac{5\sqrt{5} + 5}{5 + \sqrt{5}}\right)^3(5+555+5)3
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