Вправи 284 - 400 » 377

15 • 3 = 10 • 3 + 5 • 3 = 30 + 15 = 45; 45 : 5 = 9; 9 • 4 = 36; 36 • 10 = 360; 360 : 6 = 36 дес. : 6 = 6 дес. = 60; 60 : 10 = 6; 6 • 12 = 6 • 10 + 6 • 2 = 60 + 12 = 72; 72 : 9 = 8; 8 : 8 = 1; 1 + 14 = 15