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z własności ciągu geometrycznego:
4^2 = 8*(x-1)
16 = 8x - 8 / +8
24 = 8x /:8
3 = x
Zad 2
tak samo jak poprzednie:
4^2 = -8 * (x-1)
16 = -8x +8 /-8
8 = -8x /:(-8)
-1 = x