【简答题】指出当角 x 取何值时函数 取得最大值和最小值.
【判断题】Completeness means every necessary detail should be included in each document.
【简答题】当x取何值时,代数式x 2 -5x+7取得最大(小)值,这个最大(小)值是多少?
【判断题】The principle of completeness means to write all necessary information.
【判断题】The principle of completeness means to write all necessary information.
【简答题】求函数y=sin2x-2sinx+2cosx的最大值和最小值,并指出当x取何值时,函数取得最值.