simplify: (i)255×260-297×218(ii)23×a3×5a4(iii)3n+3n+13n+1-3n where n is a natural number

simplify: $(i) 2^{55} \times 2^{60} - 2^{97} \times 2^{18} (i i) 2^{3} \times a^{3} \times 5 a^{4} (i i i) \frac{3^{n} + 3^{n + 1}}{3^{n + 1} - 3^{n}}$ where n is a natural number

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