844
2
21
813
2
21
479
0
21
1650
0
21
1290
0
21
577
0
21
442
0
21
635
0
21
735
1
21
1230
0
21
304
0
21
544
0
21
803
0
21
707
0
21
740
0
21
559
2
21
856
0
21
1294
2
21
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Keyword(s): 数学 中2