This is the 14368th most frequent Russian word.
отнеситесь
"Treat" or "respond to" (imperative form, asking someone to approach, perceive, or relate to something in a certain way).
The word 'отнеситесь' here is used in an imperative form to request someone to exhibit a serious attitude towards the task.
Пожалуйста, отнеситесь к этому заданию серьёзно.
Please, take this task seriously.
In this sentence, 'отнесётесь' is used to inquire about someone's potential attitude or response to a suggestion.
Как вы отнесётесь к предложению организовать мероприятие?
How would you feel about the proposal to organize an event?
Here, 'отнесутся' expresses the expected or desired attitude of a group towards an idea.