1. (1)245 (2)909 (3)4 8 5 (4)6 7 (5)499 501 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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