在△ABC中,角A,B,C所对的边分别为a,b,c,若a=,b=2,sinB+cosB=,则角A的大小为______________.
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?_______