请教一下9+98+998+9998+99998的简便算法是怎么的,
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请教一下9+98+998+9998+99998的简便算法是怎么的,
![请教一下9+98+998+9998+99998的简便算法是怎么的,](/uploads/image/z/15644039-23-9.jpg?t=%E8%AF%B7%E6%95%99%E4%B8%80%E4%B8%8B9%2B98%2B998%2B9998%2B99998%E7%9A%84%E7%AE%80%E4%BE%BF%E7%AE%97%E6%B3%95%E6%98%AF%E6%80%8E%E4%B9%88%E7%9A%84%2C)
9+98+998+9998+99998
=10-1+100-2+1000-2+10000-2+100000-2
=(10+100+1000+10000+100000)-(1+2×4)
=111110-5
=111105 再答: 9+98+998+9998+99998
=10-1+100-2+1000-2+10000-2+100000-2
=(10+100+1000+10000+100000)-(1+2×4)
=111110-9
=111101
再答: 望采纳
=10-1+100-2+1000-2+10000-2+100000-2
=(10+100+1000+10000+100000)-(1+2×4)
=111110-5
=111105 再答: 9+98+998+9998+99998
=10-1+100-2+1000-2+10000-2+100000-2
=(10+100+1000+10000+100000)-(1+2×4)
=111110-9
=111101
再答: 望采纳