问题
解答题
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答案
71×2≈70×2=140,
49×3≈50×3=150,
102×6≈100×6=600,
198×5≈200×5=1000,
281×4≈300×4=1200,
429×5≈400×5=2000.
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71×2≈70×2=140,
49×3≈50×3=150,
102×6≈100×6=600,
198×5≈200×5=1000,
281×4≈300×4=1200,
429×5≈400×5=2000.