2. 7050 1026 4009
3.6835 4067 3009 8030
4. 3080 5002 2000 100
5.略
6. 7个十 7个千 7个一 7个百
7. 4900,5000,5100
5090,5100,5110
1010,1011,1012
3001,3000,2999
8.(1)8200 (2)8020
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