A:红细胞
B:白细胞
C:血小板
D:淋巴细胞
函数fx=x3+x-3的实数解落在的区间是( )
If you could give your younger self one piece of advice, what would you say?
要求:(1)作出回答并说出理由;(2)词数不少于60。
函数fx=sinx+cosx2的最小正周期为( )