Пошаговое объяснение:

[tex](9 \frac{4}{17} + 8 \frac{13}{17} ) - (13 \frac{9}{23} - 4 \frac{11}{23} ) = 17 \frac{17}{17} - 8\frac{21}{23} = 17 - 8 \frac{21}{23} = \frac{391}{23} - \frac{205}{23} = \frac{186}{23} = 8 \frac{2}{23} [/tex]