挑战习题
1/5单选题
难度:

1.在π,,0.3,3.121121112…(每两个2之间依次多一个1)中,属于有理数的有(  )个
A 6
B 4
C 3
D 2
提示1:
IOaXoOmZkOS4jeW+queOr+Wwj+aVsOWPq+WBmuaXoOeQhuaVsO+8jOaVtOaVsOWSjOWIhuaVsOe7n+ensOacieeQhuaVsA==
正确答案:RA==
PGRpdj7op6PvvJo8aW1nIHdpZHRoPTU0IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzAwLzQzL3JCQUNGRk1NUjBpQzd1VjhBQUFCNlZiN1JDMDU5Ny5wbmciPuWxnuS6juacieeQhuaVsDwvZGl2Pg==