Роздiл 3. Одночлени i многочлени » 590 (3-4)

3) 4m(2 – m) + 3(m – 2) = 0; 4m(2 – m) – 3(2 – m) = 0; (4m – 3)(2 – m) = 0; 4m – 3 = 0; 4m = 3; m = 3/4; 2 – m = 0; m = 2. 4) (с – 5)2 – (5 – Зс)2 = 0; c2 – 10c + 25 – 25 + 30c – 9c2 = 0; –8c2 + 20c = 0; 20c – 8c2 = 0; c(20 – 8c) = 0; c = 0; 20 – 8c = 0; 8c = 20; c = 2,5.