如图，已知Rt△ABC的两条直角边AC，BC的长分别为3cm，4cm，以AC为直径的圆与AB交于点D，则BD＝ cm.
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？_______
是定义在R上的奇函数，且满足
，则
的图象过点
，则
的定义域是
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