Ответ: ↓
[tex] \frac{8}{15} < a < \frac{14}{15} \\ [/tex]
[tex]a = \frac{9}{15} \: ; \: \frac{10}{15} \: ; \: \frac{11}{15} \: ; \: \frac{12}{15} \: ; \frac{13}{15} \\ [/tex]
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Ответ: ↓
[tex] \frac{8}{15} < a < \frac{14}{15} \\ [/tex]
[tex]a = \frac{9}{15} \: ; \: \frac{10}{15} \: ; \: \frac{11}{15} \: ; \: \frac{12}{15} \: ; \frac{13}{15} \\ [/tex]