设函数f(x) (x∈R)是以3为周期的奇函数, 且f(1)>1, f(2)=" a," 则 ( )
曲线在点(1,)处的切线方程为( )
已知集合,B =∣,则A∩B=()
等差数列的前n项和为=( )
设的值( )
复数=( )