Ha ha ... too much question.. why not?? surely they help in doing our homework.. we may have project of a topic unknown to us , then we should be taking help of this computer through internet and we will be finding sites like BRAINLY to help in finish our homework.. we may have different doubts in your subjects and internet and computers help us.. 

Thank u and comment for changes to answer better next time...
                                                                          yours Tanishq..
Definitely a Computer is useful for doing homework. First,a homework is given to enhance the knowledge of the doer. To enhance their knowledge you must have a source to improve like Books, Internet, etc. It is difficult to search a definite and brief topic in a book but as on Internet it is easier to do these kinds of work. Second, a homework also need a good way of presentation. By use of computers Presenting homework become easier and attractive.