December 2018 1 13 Report
Wyznacz pierwszy wyraz i różnicę ciągu arytmetycznego (  a_{n} ), jeśli:
a)  a_{1} +  a_{2} = 11 i  a_{3} +  a_{4} = 31
b)  a_{1} +  a_{3} = -2 i  a_{2} *  a_{4} = -5.
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