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a6 = 6²/[6+2] = 36/8 = 4,5
a8 = 8²/[8+2] = 64/10 = 6,4
a8 + 1,6 = 6,4 + 1,6 = 8
(a8 + 1,6) - a6 = 8 - 4,5 = 3,5 oraz a6 - a2 = 4,5 - 1 = 3,5
zatem jest to ciąg arytmetyczny o różnicy r = 3,5
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a2, x , a6 - ciąg geometryczny
a2 = 1, a6 = 4,5
Mamy zatem
x /1 = 4,5/x ---> x² = 1*4,5 = 4,5 = 9/2
x = √9/√2 = 3/√2 = (3√2)/2