Решите уравнение 567 деленное на х+3 плюс 567 делённое на х-3 =48

НАДО НЕМНОЖКО ИЗМЕНИТЬ ТЕКСТ ЧТОБЫ УЧИТЕЛЬНИЦА НЕ УЗНАЛА ЧТО Я СПИСАО С ГДЗ  !!!ПОМОГИТЕ ПОЖАЛУЙСТА !!!

Suggested Answer Key
Dear Mr Johnson,
With reference to your advertisement, in an
international student’s magazine, I would like
to apply for a volunteer position.
I am a fifteen-year-old student currently
attending middle school. I really enjoy
working with children. I hope to study
education and become a teacher. I have just
passed the Pet English exam with a grade A. At
school, I am involved in a variety of sports
teams and clubs including the psychology club.
I am described by my fellow students and
teachers as sociable, caring and creative.
Furthermore, I volunteer every week as a
group leader at a youth centre in my
neighbourhood, where I coordinate different
activities and sports for children of all ages.
From this experience I have learned to
communicate well with young people and
understand their needs. In addition to my
volunteer work, I do babysitting for some of
the families in my neighbourhood.
I have attached my application form and
references. I would be grateful if you would
consider me as a volunteer. I can be contacted
at the number on my application form at any
time. I look forward to hearing from you.
Yours sincerely,
Tara Rulstan

Площадь пола в зале прямоугольной формы 65 кв.метров. Длина зала -- 13 метров. Сколько метров плинтуса потребуется,чтобы обить пол по периметру?

7800г=?кг      350ц=?т

563см=?м      400кг=?центнера

Как найти гомологов и изомеров

Например

CH2=C-CH2-CH3

        |

      CH3

CH2=C-CH3 Почему вот так получается, откуда узнать что не надо писать CH2.

        |

      CH3

Почему один из изомеров так получается ?

CH=CH-CH2-CH2-CH3