500
0
19
457
1
19
282
0
19
399
0
19
405
0
18
526
0
18
569
0
17
307
0
17
339
0
16
303
0
16
268
0
15
329
0
15
424
0
15
367
0
15
447
0
15
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Keyword(s): 数学a