Question

Решение 2/7+1/3-1/4=

Answer 1

$1) \frac{2}{7} + \frac{1}{3} = \frac{2 \times 3}{7 \times 3} + \frac{1 \times 7}{3 \times 7} = \frac{6}{21} + \frac{7}{21} = \frac{6 + 7}{21} = \frac{13}{21}$

$2) \frac{13}{21} - \frac{1}{4} = \frac{13 \times 4}{21 \times 4} - \frac{1 \times 21}{4 \times 21} = \frac{52}{84} - \frac{21}{84} = \frac{52 - 21}{84} = \frac{31}{84}$