设幂级数<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/23817882_0.png">的收敛半径为2，则幂级数<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/23817882_0_1.png">的收敛区间是（　　）。