найдите скалярное произведение a*b,если |a|=6 а |b|=4 и угол (a,b) =135(градусов) - №12428955

найдите скалярное произведение a*b,если |a|=6 а |b|=4 и угол (a,b) =135(градусов)
- Предмет:
  Геометрия
- Автор:
  laneyyouo
- 6 лет назад

Ответы 1

cos(a b)=(a*b) /( |a| *|b|)cos135=(a*b)/ (6*4)-√2/2=(a*b)/24a*b=-12√2
- Автор:
  aniyah
- 6 лет назад
- 0
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В треугольнике ABC точка O - середина стороны BC и угол A=30*.На стороне AC отмечена такая точка D, что 2DO=BC.Найдите AB, если BD=1.
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Помогите пожалуйста перевести текст на русский(без переводчика) и ответить на вопросы
THE BEATLES
The first really important group was the Beatles, who had their first hot record in 1962. They came from Liverpool, a town in the North of England. Their music was hard and loud. It was influenced by American soul music, rhythm ‘n’ blues and rock 'n' roll. Playing in small clubs, with poor equipment, they had to rely on the beat produced by drums, bass and rhythm guitars.
The Beatles went to Hamburg, in Germany, several times between 1959 and 1961, where they played for several hours each evening in small clubs. Because of their long experience, by 1961 they played their instruments better than most of other local groups. But what made the Beatles special was the singing and songwriting of John Lennon and Paul McCartney.
The group got a clever manager, a recording contract and a very good record producer.
By 1963 they achieved everything in Britain - their records all went to number one in the charts - so they turned to America and had even greater success. After two months in America, in early 1964, they had the top five records in the charts.
After 1963 the Beatles concentrated on films and albums (long-playing records).
By 1967 the Beatles started to grow apart. Lennon was interested in left-wing politics, Ringo Starr - in acting. They formed their own record company and made the white Album (1968), Abbey Road (1969), and Let Baby (1970), but after business problems and personal disagreements they split up in 1970.

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