(2)四;千;8;十
(3)9999;10000
2. 1375 6090 5008
3. 4750 2009 6408
4.四千五百八十九;五千
5. 999 1000 1001 (1000)
3999 4000 4001 (4000)
9000 9001 9002 (9000)
6.(1)2000 (2)10
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