Завдання 1402 - 1500 » 1414

Спростіть вираз: 1) 4,5a ∙ (–2b) = –9ab; 2) –2c ∙ (–0,1d) ∙ 5 = cd; 3) –0,5n ∙ 6 ∙ (–5m) ∙ 11/3 = 0,5n ∙ 30m ∙ 4/3 = 5nm ∙ 4 = 20mn; 4) –3x ∙ (–5,2y) ∙ (–1/2) ∙ 1/13z = 3xy ∙ 5,2 ∙ –1/26z = –3xyz ∙ 0,2 = –0,6xyz.