复数满足,则复数的模等于_______________.
已知复数Z满足,则复数Z = ______________.
已知函数f (x)满足:f ( p + q) = f ( p) f (q),f (1) =3,则++++的值为_______________.
若对一切实数x恒成立,则实数a的取值范围是_______________.
不等式的解集为_______________.
已知△ABC中,,,,那么等于_______________