Решите уравнение
(0,21 m-0,66m)*10:2:3=0

(0,21m - 0,66m) * 10 : 2 = 0 * 3(0,21m - 0,66m) * 10 : 2 = 0 (0,21m - 0,66m) * 10  = 0 * 2(0,21m - 0,66m) * 10 = 0 0,21 m - 0,66m = 0 : 10-0,45m = 0m = 0 : (-0,45)m = 0