Решите рационально 3 12/19 × 4 3/23 + 1 4/19 × 5 7/23 - 1 8/19

Решите задачу:

$\frac{69}{19} * \frac{95}{23}+ \frac{23}{19} *5$
$1) \frac{69}{19} * \frac{95}{23} = \frac{69*95}{19*23} = \frac{6555}{437} =15$
$2) \frac{23}{19} *5= \frac{23}{19} * \frac{5}{1} = \frac{115}{19} =6 \frac{1}{19}$
$3) 15+ 6\frac{1}{19} = \frac{15}{1} + \frac{115}{19} = \frac{15*19}{1*19} + \frac{115}{19} = \frac{285}{19} + \frac{115}{19} = \frac{400}{19} =21 \frac{1}{19}$