GT
Gugu Taras
Давай, поробуем:
c^2/(c^2-4) - c/(c-2)= c^2/(c^2-4) - c(c+2)/(c-2)(c+2)= (c^2-c^2-2c)(c^2-4) =
=-2c/(c^2-4)
с домножить на с+2 (привести к общему) и считать
Ответ
c^2 / (c^2 - 4) - c / (c - 2) =
= c^2 / (c+2) - c/(c-2) =
= c/(c-2) * [c/(c+2) - 1] =
= c/(c-2) * [c - (c+2)]/(c+2) =
= c/(c-2) * [c - c - 2]/(c+2) =
= c/(c-2) * (-2)/(c+2) =
= (-2c) / (c-2)(c-2) =
= (-2c) / (c^2 -4)