Решите два примера по действиям

Решите задачу:

$22,2: 5 \frac{2}{7} - 2 \frac{3}{5}= 1) 22.5 : 5 \frac{2}{7} = \frac{222}{10} : \frac{37}{7}= \frac{222*7}{10*37} = \frac{42}{10}= \frac{21}{5} 2) \frac{21}{5}- 2 \frac{3}{5} = \frac{21}{5}- \frac{13}{5} = \frac{8}{5}= 1 \frac{3}{5} ( 7\frac{1}{4}-6 \frac{7}{18}) * 7.2+2.8= 1) 7 \frac{1}{4}-6 \frac{7}{18} = \frac{29}{4}- \frac{115}{18} = \frac{261-230}{36} = \frac{31}{36} 2) \frac{31}{36}* \frac{72}{10}= \frac{62}{10}= 6.2 3) 6.2+2.8= 9$