1500
0
19
549
7
19
812
0
18
10996
0
18
831
0
18
1024
0
18
1249
0
18
612
1
18
927
10
18
1007
0
18
675
0
17
810
0
17
722
0
17
501
4
17
847
0
17
551
1
17
790
7
17
1664
0
17
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Keyword(s): 中学数学