Частина 2 — Вправи: 192

192. Розкрийте дужки і спростіть вирази.

а. x – (2x + 7) = x – 2x – 7 = -x – 7;

б. а – (4а + 8) = a – 4a – 8 = -3a – 8;

в. 5s – (3s – 2) = 5s – 3s + 2 = 2s + 2;

г. 4x – 5 – (1 – 2x) = 4x – 5 – 1 + 2x = 6x – 6;

д. –2(x + 3) – 4(x – 5) = -2x – 6 – 4x + 20 = -6x + 14;

е. 7,2(а – k) + 2,4(k – 2а) = 7,2a – 7,2k + 2,4k – 4,8a = 2,4a – 4,8k;

ж. 3(29f + 4) – (12 – 13) = 23f + 12 – 12 + 13 = 23f + 13;

з. 18(1000 – 16d) + 2d = 125 – 2d + 2d = 125.