⑦ Найди значение выражения х + \frac{15}{42}, если х = \frac{4}{42}; \frac{8}{42}; \frac{25}{42}

1) Если х = \(\frac{4}{42}\): \[\frac{4}{42} + \frac{15}{42} = \frac{19}{42}\] 2) Если х = \(\frac{8}{42}\): \[\frac{8}{42} + \frac{15}{42} = \frac{23}{42}\] 3) Если х = \(\frac{25}{42}\): \[\frac{25}{42} + \frac{15}{42} = \frac{40}{42} = \frac{20}{21}\]