2. 732 501 490
3. 4个一;4个百;4个十
4. 300 840 720 537 604 800 500 400
5. (1)280 (2)738 (3)108
6. 390,400,410,420
700,701,702,703
901,900,899,898
555,456,357,258
7.略
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