问题3： 如何理解下列语句 Although we cannot easily graph linear programs with more than two variables,the same intuition holds.If we have three variables,then each constraint corresponds to a half-space in three-dimensional space.The intersection of these half-spaces forms the feasible region.Although we cannot easily graph linear programs with more than two variables, the same intuition holds. If we have three variables, then each constraint corresponds to a half-space in three-dimensional space. The intersection of these half-spaces forms the feasible region