9) (12+7)-(132-90). 22 23 22 23

$$ (12 \frac{5}{22} + 7 \frac{17}{22}) - (13 \frac{7}{23} - 9 \frac{15}{23}) = (12 + 7) + (\frac{5}{22} + \frac{17}{22}) - ((13 - 9) + (\frac{7}{23} - \frac{15}{23})) = 19 + \frac{22}{22} - (4 - \frac{8}{23}) = 19 + 1 - (3 \frac{23}{23} - \frac{8}{23}) = 20 - 3 \frac{15}{23} = 19 \frac{23}{23} - 3 \frac{15}{23} = (19 - 3) + (\frac{23}{23} - \frac{15}{23}) = 16 + \frac{8}{23} = 16 \frac{8}{23}$$

Ответ: $$16 \frac{8}{23}$$