Вправи: 272

272. Спрости вираз.

а) (2a² + 3a – 4) + (5a² – a + 7) = 7a² + 2a + 3;

б) (6x³ + 8x – 5) – (4x² + 8x – 5) = 6x³ + 8x – 5 – 4x² – 8x + 5 = 6x³ – 4x²;

в) (3z⁴ – 2z³ + 12z – 5) – (3z⁴ – 2z – 5) = 3z⁴ – 2z³ + 12z – 5 – 3z⁴ + 2z + 5 = –2z³ + 14z;

г) (–5с³ – 2с + 3с²) – (1 – с – 2с² – 5с³) = –5с³ – 2с + 3с² – 1 + с + 2с² + 5с³ = 5с² – с – 1.