简便计算(1)9999+9998+9997+9996 ...5
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发布时间:2024-02-27 01:06
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时间:2024-03-21 07:11
(1)9999+9998+9997+9996,
=10000×4-(1+2+3+4),
=40000-10,
=39990;
(2)22222×999999,
=22222×(1000000-1),
=22222×1000000-22222×1,
=22222000000-22222,
=22221977778;
(3)454十999×999十545,
=(454+545)+999×999,
=999+999×999,
=(999+1)×999,
=1000×999,
=999000;
(4)20082008×2007-20072007×2008.
=2008×1001×2007-2007×1001×2008,
=0.