【多选题】Another reason convenience foods are likely to become more popular is the increase in the number of women with children, who work in full-time employment. 2. In the UK, for example, working mothers si...
【简答题】已知锐角△ABC中的三个内角分别为A,B,C. (1)设 BC ? CA = CA ? AB ,求证:△ABC是等腰三角形; BC (2)设向量 s =(2sinC,- 3 ), t =(cos2C,2cos 2 C 2 -1),且 s ∥ t ,若sinA= 2 3 ,求sin( π 3 -B)的值.
【多选题】Another reason convenience foods are likely to become more popular is the increase in the number of women with children, who work in full-time employment. 2. In the UK, for example, working mothers si...