Частина 1 — Вправи: 1064

1064. Розкрий дужки та спрости вираз:

а) 2(а + b) + 3(а – 2b) = 2a + 2b + 3a – 6b = 5a – 4b;

б) 6(х – 2у) – 2(3х + у) = 6x – 12y – 6x – 2y = –14y;

в) (х + 3у – 2) + (2х – 3у + 6) = х + 3у – 2 + 2х – 3у + 6 = 3x + 4;

г) –5(a + 2b – 3с) – 2(3a – 5b) = –5a – 10b + 15c – 6a + 10b = 15c – 11a;

ґ) (2х + 5у) – 2(х + у – 3z) = 2x + 5y – 2x – 2y + 6z = 3y + 6z;

д) 7a – 3(2a – 4b) – 12b = 7a – 6a + 12b – 12b = a;

е) 17 + 3(4х – 5у) – (12х + 15у + 7) = 17 + 12x – 15y – 12x – 15y – 7 = 10 – 30y;

є) (a + b + c) – (a + b) + (a – c) = a + b + c – a – b + a – c = а.