Выполни действия и запиши ответы

1. \(\cfrac{7}{30}-\cfrac{5}{30}+\cfrac{9}{30}=\) [ ].
2. \(\cfrac{14}{8}-\cfrac{10}{8}-\cfrac{2}{8}=\) [ ].
3. \(\cfrac{70}{113}+\cfrac{15}{113}-\cfrac{19}{113}=\) [ ].
4. \(\cfrac{6}{7}+\cfrac{145}{7}-\cfrac{150}{7}=\) [ ].