问题
解答题
估算下面各题.
|
答案
39×5≈200; | 303×7≈2100; | 57×6≈3600; | 89×4≈360; |
899×8≈7200; | 502×3≈1500; | 797×5≈4000; | 312×9≈2700. |
估算下面各题.
|
39×5≈200; | 303×7≈2100; | 57×6≈3600; | 89×4≈360; |
899×8≈7200; | 502×3≈1500; | 797×5≈4000; | 312×9≈2700. |