��.50 �� 10-11 �� (��)

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$�� 50. �� :�) 1+11+...+{111...1}-n ��; �) x+2x^2+3x^3+...+nx^n;�) 1/(k(k+1))+1/((k+1)(k+2))+...+1/((k+n-1)(k+n));�)...$

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50. �� :

�) 1+11+...+{111...1}-n ��; �) x+2x^2+3x^3+...+nx^n;

�) 1/(k(k+1))+1/((k+1)(k+2))+...+1/((k+n-1)(k+n));

�) sin(x)+sin(2x)+...+sin(nx).

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