3.105: Binomial terms equal

In the expansion of $(x+x^{2})^{8}$ in ascending powers of $x$, the 3rd and 6th terms are equal. Find the value of $x$.

In the expansion of $\left(x+\dfrac{2}{x}\right)^{n}$ in decreasing powers of $x$, the 6th term is a constant. Find the value of the positive integer $n$.

Find the value of the 6th term.