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一、1.10 10 2.50 10 1 3.5 5 10 2 2 5 4.(1)180(2)6 75.15 90 6.5 7.(1)43 45 47 49(2)31 21 11 1 8.599.=><><>10.(1)69~30都对(2)大于70的数都对
1.10 10 2.50 10 1 3.5 5 10 2 2 5 4. (1) 180 (2) 6 75.15 90 6.5 7. (1) 43 45 47 49 (2) 31 21 11 1 8.599. => <> <> 10. (1) 69 ~ 30 are right (2) more than 70 are the right number