Решите уравнение 1) (12m - 5m) *4=252 2) 45 : (4m - m)=3 3) (16m + 5m) : 18=7

1. 7·m·4 = 252,28·m = 252,m = 252:28,m = 9.Проверка:(12·9 - 5·9)·4 = 252,(108 - 45)·4 = 252,63·4 = 252,252 = 252.2. 45:3·m = 3,3·m = 45:3,3·m = 15,m = 15:3,m = 5.Проверка:45:(4·5 - 5) = 3,45:15 = 3,3 = 3.3. 21·m:18 = 7,21·m = 7·18,21·m = 126,m = 126:21,m = 6.Проверка:(16·6 + 5·6):18 = 7,(96 + 30):18 = 7,126:18 = 7,7 = 7.