Question

Выполните действия:1) (12: 3 3/5+2/3)×2/3= 2)(19/21: 1 1/21) : ( 38/41: 2/41))= Решите пж

Answer 1

Ответ:

1)

$12 \div 3\frac{3}{5} + \frac{2}{3} = 12 \times \frac{5}{18} + \frac{2}{3} = 2 \times \frac{5}{3} + \frac{2}{3} = \frac{10}{3} + \frac{2}{3} = \frac{10 + 2}{3} = \frac{12}{3} = 4$

2)

$( \frac{19}{21} \div \frac{11}{21} ) \div ( \frac{38}{41} \div \frac{2}{41} ) = \\ \frac{19}{21} \div \frac{11}{21} = \frac{19}{21} \times \frac{21}{11} = \frac{19}{11} \\ \frac{38}{41} \div \frac{2}{41} = \frac{19 \times 2}{41} \times \frac{41}{2} = 19 \\ \frac{19}{11} \div 19 = \frac{19}{11} \times \frac{1}{19} = \frac{1}{11}$