Вычислите произведение
ж) 12*5 2/3
3) 21 1/9*9​

12÷5 2/ 3 = 12÷ 2 + 5·3/3 = 12÷ 17/3 = 12× 3/17 = 12·3/17 = 36/17 = 2·17 + 2 17 = 2 2/17

21 1/9 ×9 = 1 + 21·9/9 ×9 = 190/9 ×9 = 190·9/9 = 1710/9 = 190 · 9/9 = 190 = 190