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？_______
是公比为
的等比数列,且
,
,则
的值为．
离心率为2，有一个焦点与抛物线
的焦点重合，
的值为．
在区间
上的最大值是_________．
,且
,则
的最小值为___________．
和
所成角大小为____________.推荐套卷
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？_______
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