• 2022-05-29
     指出下列集合中哪些是 [tex=3.0x1.357]BTuMgdu50zk9vvD7VuEqDc/wzH/S0fh+6wscfZT1CSo=[/tex]的子环?(1) [tex=13.071x2.786]cc3WTj0JH/gK5NTGIlwtOkLAGtZRyyhWRnOlEgS2ZEJjlz4LcsDGHMBEzMBXr+Yc8ysYINaJpZgzBx2x2+5yBK6sizDU8wobe4ZOIE9QejaehVT3/YUABpZdJqiVMGytAyWxyfPPFciKrsEpO0ReJg==[/tex](2)[tex=12.714x2.786]cc3WTj0JH/gK5NTGIlwtOkLAGtZRyyhWRnOlEgS2ZELTWCXQYbcHfOtXa8OQ1hnd7bi5XfEyENlNqz81Q9nHow0SaOBUe9ZesZIzFTec1FNMp0Yd7WjIdMVfFUdkLsbWHSula8qf2X/g7ovxTdJfgA==[/tex].