(9а^2-49)×(1/3а+7 - 1/3а-7)+а-13 при а=345

Question

(9а^2-49)×(1/3а+7 - 1/3а-7)+а-13 при а=345

Answer 1

9а^2-49+a-13=9a^2-62+a=9*119025-62+345=1071225+283=1071508