828
3
20
571
0
20
577
1
20
939
2
20
1383
1
20
814
0
20
754
0
20
711
0
20
549
0
20
1039
0
20
821
0
20
1159
0
20
573
6
20
897
4
20
1058
0
20
286
0
20
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Keyword(s): 中3 数学