Розділ 1. ЦІЛІ ВИРАЗИ » 284

Спрости вираз. a) (2x2 – x + c) – (x2 + c + 5) – (3c – x2 – x) = 2x2 – x + c – x2 – c – 5 – 3c + x2 + x = 2x2 – 3x – 5; б) 3,6cx2 + 1,8c2x – 1,2x + (–1,8c2x – 1,6cx2 – 1,2x) = 2cx2 – 2,4x; в) 21/2ax2с + 11/3x2c – (4/3cx2 + 5/2ax2c) = 21/2ax2c + 4/3x2c – 4/3x2c – 21/2ax2c = 0; г) 21/3az2 – (2/3a2z – 21/6az2 – 12/3x) – 41/2az2 = 21/3az2 – 2/3a2z + 21/6az2 + 12/3z – 41/2az2 = 22/6az2 + 21/6az2 – 43/6az2 – 2/3a2z + 12/3z = –2/3a2z + 12/3z.