Как это выражение? (x^2-y^2)//(3xy)*(3y)//(xy)

получается       х         19         х - 11                                                                  

                            =   +                                                                      

                            х+3       84         х+3-7

ответ :

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hello, my friend! i received your letter. i am very pleased, that you i like to play football. my my favorite sport is swimming. i go to training 3 times a week. i can. swim breaststroke and backstroke. v now the coach is teaching me, how to swim butterfly. i'm very i like going to the pool. i have have many friends. in summer we will go to competition. this will be my