对幂级数<img src="https://static.zxtiku.com/wangke/imgs/topic/45f11b21916a371b87f7981738af6dc9.png"/> ,下面说法:(1)如果取<img src="https://static.zxtiku.com/wangke/imgs/topic/fb85477d784900af75fafd0b52d2bb0c.png"/> ,则收敛半径<img src="https://static.zxtiku.com/wangke/imgs/topic/9a355482174c18dbb129a5d91711dffc.png"/> ,谱半径<img src="https://static.zxtiku.com/wangke/imgs/topic/005ef04560c342fc9d82be38c815f1da.png"/> ;(2)如果取<img src="https://static.zxtiku.com/wangke/imgs/topic/3af521989be069e2d3f69ac9b178d50d.png"/> ,则收敛半径<img src="https://static.zxtiku.com/wangke/imgs/topic/4408a8aa16b23351af450a3392879ca3.png"/> ,谱半径<img src="https://static.zxtiku.com/wangke/imgs/topic/0d42547300d3e3a1dcd9fcedd2cf3c25.png"/> ;(3)如果取<img src="https://static.zxtiku.com/wangke/imgs/topic/586345185990c2d39334605d1b8ca3c0.png"/> ,则收敛半径<img src="https://static.zxtiku.com/wangke/imgs/topic/7ed6f1bb79a0ec5671ffcdf4e89efc3d.png"/> ,谱半径<img src="https://static.zxtiku.com/wangke/imgs/topic/30c66ee23f7fc5510ebffcc2048d42db.png"/> ;(4)如果取<img src="https://static.zxtiku.com/wangke/imgs/topic/a2438810e547486074f27156309c2574.png"/> ,则收敛半径<img src="https://static.zxtiku.com/wangke/imgs/topic/58c1860af200cd9a8be0ff2153322794.png"/> ,谱半径<img src="https://static.zxtiku.com/wangke/imgs/topic/4b5534e6352a83560d8265b49ec34ecc.png"/> .下列说法正确的是____