一个篮球运动员投篮一次得3分的概率为,得2分的概率为,不得分的概率为,其中.已知投篮一次得分的期望是2,则的最大值是____________.
设是定义在R上的奇函数,且满足,则
已知幂函数的图象过点,则
函数的定义域是
A class collects $50 to buy flowers for a classmate who is in the hospital. Roses cost $3 each, and carnations cost $2 each. No other flowers are to be used. How many different bouquets could be purchased for exactly $50?_______