问题
解答题
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答案
28×9≈2800, | 196×5≈1000, | 41×6≈240, |
416×8≈4000, | 121×4≈600, | 278×7≈2100, |
38×5≈200, | 318×5≈1500, | 88×7≈630, |
61×7≈420, | 54×6≈300, | 68×9≈700. |
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28×9≈2800, | 196×5≈1000, | 41×6≈240, |
416×8≈4000, | 121×4≈600, | 278×7≈2100, |
38×5≈200, | 318×5≈1500, | 88×7≈630, |
61×7≈420, | 54×6≈300, | 68×9≈700. |