Даны векторы: с=( 5;4), d=(2;-6). Постройте векторы в ПДСК. Найдите: c+d, c-d, c d, -2а.

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Must Waste More Time...

находим производную y`=-корень(х)+3

приравниваем к нулю         - корень(х)=-3

                                                  корень(х)=3

                                                  х=9