November 2018 2 15 Report

1. ciagu arytmetycznego 1, 4, 7, ... n-tego wyrazu an wzor jest???

2. ciagu aytmetycznego an, ktorego a7= 1/10, suma a1+ a4+ a7+ a10+ a13 =???

3. ciag an jest ciag arytmetyczny, ktorego an = 2n - 1. tego ciagu S20= a1 + a2 + ... a20=???

prosze pomozcie, daje naj.


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