Ahyperbola(双曲线)wjthvertices(顶点)(-2,5)and(-2,-3),has an asynptote(渐近线)that passes the point(2.5) Then an equarionk of the hyperbola is
集合的真子集的个数为()
已知集合,,则()
设全集,集合M=,集合N=,则=( )
如图,在复平面内,复数,对应的向量分别是,,则复数对应的点位于()
若,为虚数单位,且则()