1). 189:3=3(часа) - затратит рабочий на 189 деталей.
Ответ:3 часа.
1/4 и 1/6 = 6/24 и 4/24 = 3/12 и 2/12
1/10 и 1/4 = 4/40 и 10/4 = 2/20 и 5/20
1/6 и 1/8 = 8/48 и 6/48 = 4/24 и 3/24
1/6 и 1/9 = 9/54 и 6/54 = 3/18 и 2/18
2/15 и 3/10 = 20/150 и 45/150 = 4/30 и 9/30
5/12 и 3/8 = 40/96 и 36/96 = 10/24 и 9/24