{3x-y=7 {9x^2+6xy+y^2=121 как решить помогите пожалуйста!!!!!срочно!!!!!! - Знания.site

{3x-y=7
{9x^2+6xy+y^2=121 как решить помогите пожалуйста!!!!!срочно!!!!!!
- Предмет:
  Алгебра
- Автор:
  lópezsvkk
- 5 лет назад

Ответы 1

у=3х-7
9х^2+6x(3x-7)+(3x-7)^2=121
9x^2+18x^2-42x+9x^2-42x+49=121
36x^2-84x-72=0 |:12
3x^2-7х-6=0
х1=3, х2=-2/3
у1=2, у2=-9
- Автор:
  diet coke
- 5 лет назад
- 0
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