Периметр треугольника ABC равен 19.3см. АС=7.9см.Сторона АВ в 2 раза короче стороны ВС.Найдите сторону ВС.

((4a^2-4ab+b^2)/(3a^2b))*((b^2a)/(b^2-4a^2)) помогите упростить, застреваю на сокращении.

составьте пожалуйста диалог на тему "В школьной мастерской" там должны быть слова клещи,кусачки,ножницы,опилки,плоскогубцы,тиски(5-6 предложений)

решить уравнение 300-5400/(24+х)=210

(Перевести текст)

Hitch-hiking is very popular with young people. Young people like to get free lifts from drivers of cars, lorries, etc.
Hitch-hiking was once a cheap and friendly way to travel. It was also romantic, interesting and ... free!
But now hitch-hiking is quite dangerous. We often hear or read that drivers attack or murder hitch-hikers. There are also hitch-hikers who rob drivers.
Because of this some countries don't allow people to hitch-hike