2 5 x 9 5 x 4 19 5 x 10 July 8, 2019 16 32 64 128 2 5 x 1 9 2 5/9 x - 15 x-1 2 x 2 5 9 x 5 / 2 −9 ∙ 2 5 + 9 ∙ (−4 5)
