(3x-1)^2-(x-2)(2+x) Объясните и помогите решить >.< пожалуйста

(3x-1)^2-(x-2)(2+x) Объясните и помогите решить >.< пожалуйста
- Предмет:
  Алгебра
- Автор:
  urijah
- 6 лет назад

Ответы 2

так (а-b)²=a²+2ab+b²(3x-1)=9x²-6x+13x наш а-1 наш -ба²-b²=(a+b)(a-b)a+b=b+a(x-2)(2+x)=x²-4x-2 nash a-b2+x nash b+a9x²-6x+1-x²-4=8x²-6x-3
- Автор:
  johan
- 6 лет назад
- 0
решаем скобку с корнем по формуле (а+б) ^2=а^2+б^2+2аб=9х^2+1+6хперемножаем последние две скобки=2х+х^2-4-2х=х^2-4производим вычитаниеВАЖНО: во втором действии меняем знаки, т.к. перед скобками стоит минус 9х^2+1+6х-х^2+4= 8х^2+6х+5
- Автор:
  immanuel
- 6 лет назад
- 0
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(3x-1)^2-(x-2)(2+x) Объясните и помогите решить >.< пожалуйста

Ответы 2

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