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ответ:

пошаговое объяснение:

1 13/14-(2-1 11/35): 9/25+4/21=3/14

2-1 11/35=24/35

24/35: 9/25=24/35*25/9=40/21=1 19/21

1 13/14-1 19/21=1 39/42-1 38/42=1/42

1/42+4/21=1/42+8/42=9/42=3/14

[tex] \frac{5}{13} \times (6.5x - 5. \frac{1}{5} y) - 2.4( \frac{5}{8} x - \\ \frac{5}{6} y) = [/tex]

[tex] \frac{5}{13} \times \frac{65}{10} x - \frac{5}{13 } \times \frac{26}{5} y - \\ \frac{24}{10} \times \frac{5}{8} x + \frac{24}{10} \times \frac{5}{6} y = [/tex]

[tex] \frac{5}{2} x - 2y - \frac{3}{2} x + 2y = \\ \frac{2}{2} x = x = 4.5[/tex]