如果长方体的顶点都在半径为3的球的球面上,那么该长方体表面积的最大值等于_____________;
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?_______
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