15 3 x 7 2 x 3 8 2 July 8, 2019 16 32 64 128 15 19 x 2 3 7 19 x 2 3 8 3 x 17 19 Efectuați 7 2 x 3 8 2 x 3 15 2x 3 Quanto é 15 3 x 7 2 x 3 8 2 3 7 15 x x − ⋅− − при x = −7 7/15 x 3
