sofija1739 sofija1739
  • 20-12-2022
  • Mathematics
contestada


8. Спростіть
(x+3)(3-x)-x(2+x)+2x^2і знайдіть його
вираз
значення при x=-10 .



9. Доведіть, що для будь-якого натурального числа n
значення виразу
-(n-10)(n-1)+(n+2)(n+5) кратне 9

Respuesta :

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