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Здравствуйте! Прошу помощи в следующем вопросе: Найти коэффициенты при a=x^2•y^2•z^4, b=x^2•y•z^3, c=x^4•y^2 в разложении (5•x+4•y+z^2)^6. Я понимаю, что речь о полиномиальной теореме, и 1) a=x2•y2•z4 = (x^2)^1•(y^2)^1• (z^2)^2 2) b=x2•y•z3 = (x^2)^1•(y^1)^1• (z^3)^1 3) c=x4•y2 = (x^2)^2•(y^2)^1• (z^1)^0 Но к сожалению, по материалам лекции не могу понять, как верно прописать степени, чтобы прийти к коэффициенту 6. И вижу, что коэффициент по крайней мере при b будет равен 0. Или я ошибаюсь? Подскажите, пожалуйста
При разложении многочлена чтобы вычислить коэффициенты при нужно из скобок взять множитель из скобок взять множитель ..., из скобок взять множитель Этот коэффициент равен Исходя из этого рассмотрим три заданных случая, приняв, что Случай 1
Тогда и искомый коэффициент равен
Случай 2
В разложении заданного многочлена не может быть слагаемого потому что невозможно получить множитель Можно, наверное, считать, что искомый коэффициент равен нулю. Случай 3
Тогда и искомый коэффициент равен
5
Большое спасибо, я немного разобралась сама, вы подтвердили мои догадки, теперь все встало на свои места)
Об авторе:
Facta loquuntur.
Форма ответа
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