Решите пж (5 3/10-3 4/5*13/38)*5/84+2 1/12*4/15 по действиям! Дам 10 балов

Решите задачу:

$1. 3 \frac{4}{5}* \frac{13}{38}= \frac{19*13}{5*38}= \frac{1*13}{5*2}= \frac{13}{10}$

$2. 5 \frac{3}{10}- \frac{13}{10}=4 \frac{13}{10}- \frac{13}{10}=4$

$3. 4* \frac{5}{84}= \frac{4*5}{1*84}= \frac{1*5}{1*21}= \frac{5}{21}$

$4. 2 \frac{1}{12} * \frac{4}{15}= \frac{25*4}{12*15}= \frac{5*1}{3*3}= \frac{5}{9}$

$5. \frac{5}{21}+ \frac{5}{9}= \frac{15+35}{63} = \frac{50}{63}$