Ответ учителя по предмету Алгебра
Пусть ширина прямоугольника будет Х см, тогда длина 3Х см.
Х · 3Х = 75
3Х² = 75
Х² = 25
Х₁ = -5 < 0 ⇒ не подходит по усл. задачи
Х₂ = 5 (см) — ширина
3·5 = 15 (см) — длина
2 · (5+15) = 40 (см) — периметр прямоугольника
Похожие вопросы от пользователей
срочно!!!!!
Take the book … is on the table.
A. what B. which C. whose
She was the first woman … reached the top.
A. who B. which C. whose
The girl, … sisters study in my school, looks very nice.
A. what
B. which
C. whose
4. I don’t understand people … eat popcorn during the movie.
A. who
B. which
C. whose
5. The girl _____ wore a pink dress attracted everybody’s
attention at our school.
A. what
B. which
C. who
а)3*(1+2xy)(1-2xy)
б)(a+b)^2-(a-b)^2
в)(x^2-y^3)^2