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666*778+333*444 (巧算)
人气:432 ℃ 时间:2020-02-05 20:25:33
解答
666*778+333*444
=666×778+666×222
=666×(778+222)
=666×1000
=6660001999+999*999(巧算)1999+999*999=1000+999×(1+999)=1000+999000=1000000
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