填空题 2.设y₁(x)，y₂(x)为y’+P(x)y=Q(x)的特解，又py₁(x)+2qy₂(x)为y’+P(x)y=0的解，py₁(x)一qy₂(x)为y’+P(x)y=Q(x)的解，则p=_____，q=_______．