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b) 2k-3 + 2k+1 + 2k+5 /3 = 6k+3/3 = 3(2k+1)/3 = 2k+1
c) 2k+1 + 2k+2 + 2k+3 /3 = 6k+6/3 = 2k+2
2 k - 1 + 2k + 1.......4k
_____________ = ____ = 2k
........2................2
b ] 2 k - 3 + 2 k + 1 +2k + 5 ........6k + 3
_______________________ = ___________ = 6k
..............3......................... 2
c] nie wiem
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