设命题p:关于方程x^2+kx+1=0无实数根,函数f（x）=x^3-kx^2+3kx+1在（负无穷,正无穷）上
既有极大值又有极小值,若命题”p或q“是真命题,”p且q“是假命题,求实数k的取值范围