54. 2. 2. 2. 2.

\begin{array}{l} ext{Zet} =\displaystyle {\lim_{ ext{qj } n o 8}} 3 ( 13 k^{10}+10 u^{10}+10 z^{10}+ \dots+ \dots+ 10 z^{10}-10 f^{10}+ \dots+ 10 z^{10}-10 f^{10}+ \dots) \\ \qquad = 90 ext{ m} \end{array}