9999×7778+3333×6666怎么简便计算
人气:180 ℃ 时间:2019-11-06 14:33:03
解答
9999×7778+3333×6666
=9999×7778+3333×3×2222
=9999×7778+9999×2222
=9999×(7778+2222)
=9999×10000
=99990000
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