Odpowiedź:
[tex]a) \\ 3(4a + 5) + 7a - 2 = 12a + 15 + 7a - 2 = 19a + 13 \\ b) \\ - (x + y) - (x + y) = - x - y - x - y = - 2x - 2y \\ c) \\ (4 + a)(5 + 2a) + 6 {a}^{2} = 20 + 8a + 5a + 2 {a}^{2} + 6 {a}^{2} = 8 {a}^{2} + 13a + 20 \\ d) \\ - 2(4 + 5y) + 3(5 + 2y) = - 8 - 10y + 15 + 6y = - 4y + 7[/tex]
[tex]e)(2 + x)(x - 4) = 2x - 8 + {x}^{2} - 4x = {x}^{2} - 2x - 8[/tex]
