三阶矩阵<img class=jc-formula data-tex=A src=https://huaweicloudobs.ahjxjy.cn/60BDCDAB2585C1363A4374A112B62C6E.png style=vertical-align: middle;/>的特征值为-2,1,3,则下列矩阵中奇异矩阵是
①
<img class=jc-formula data-tex=2I+A src=https://huaweicloudobs.ahjxjy.cn/5A8258D6D8D57E9D4202E2D876248700.png style=vertical-align: middle;/>
②
<img class=jc-formula data-tex=2I-A src=https://huaweicloudobs.ahjxjy.cn/61E25C41F72852549DCBE90CA3DF1AD6.png style=vertical-align: middle;/>
③
<img class=jc-formula data-tex=A-3I src=https://huaweicloudobs.ahjxjy.cn/4AEFC413AD122D764B0C031836BAC52B.png style=vertical-align: middle;/>
④
<img class=jc-formula data-tex=I-A src=https://huaweicloudobs.ahjxjy.cn/A0CEE3BB01A9B8389A3BD861FC738E9D.png style=vertical-align: middle;/>