Помогите док-ть 3 случай положения вписанного угла, очень нужно!!!!

(a^3 + b^3 + 3b^2 + 3b + 1) / (a^2 - ab- a + (b + 1)^2) преобразуйте дробь

С ОБЬЯСНЕНИЕМ!1%ОТ 5.96.    1%=0.079.    34%ОТ 186.   62%=53.94

У Паши и Андрея денег одинаково. Паша купил 2 карандаша и у него осталось 80 копеек. Андрей купил 4 карандаша и у него осталось 30 копек. Сколько денег было у каждого мальчика?

Mark*s father is a pilot.Mark wants to be a pilot,too.He wants to fly into space.But he is not brave.He is always afraid of the dark.He can not a dark room or to dark street without his father or mother.And his father says-You can*t be a pilot,Mark.You can*t fly into space.It is very dark in space and you are afraid of the dark.A pilot must be brave and you are not brave.*Come with me into the dark room.I am not afraid*,says Mark.*No,no,*says his faher.*You must go there without me.You must stay there for ten minutes.*Mark daesn*t want to go there.But he wants to be a pilot very much.And he goes into the dark room and stays there for ten minutes.Father is happy.His son is a brave boy.Mark is happy,too.He knows that he can be a pilot and fly into space.

ответить на вопросы 1. why does Mark go into the dark room? 2. why is father happy? 3.is Mark happy, too? Why?