2102
0
21
411
2
20
794
0
20
803
0
20
1099
0
20
1272
0
20
806
0
20
1623
0
20
768
0
20
647
0
20
1637
0
20
1471
0
20
5318
0
20
929
0
19
700
4
19
1160
0
19
269
0
19
1095
0
19
938
0
19
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Keyword(s): 数学a