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？_______
中，
为一条对角线，
， 则
（）
，
，若
有两个不相等的实根，则实数
的取值范围是____________.
的各项均为正数，且
，
.
，则
.
（其中
为自然对数的底数），则
=_____.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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