Giải max/min{6x+5y}. x−2y≥−2, 3x+7y≤21, 4x−y≤20, 4x+5y≥−20,y≥−524/30Giải \[\max /\min \{ 6x + 5y\} \], \[\left\{ {\begin{array}{*{20}{l}}{x - 2y \ge - 2,}\\{3x + 7y \le 21,}\\{4x - y \le 20,}\\{4x + 5y \ge - 20,}\\{y \ge - 5}\end{array}} \right.\]\[\max 6x + 5y = 35.03,\quad \min 6x + 5y = - 27.69\]\[\max 6x + 5y = 36.03,\quad \min 6x + 5y = - 28.69\]\[\max 6x + 5y = 37.03,\quad \min 6x + 5y = - 28.79\]\[\max 6x + 5y = 36.01,\quad \min 6x + 5y = - 27.79\]Giải thíchChọn đáp án A