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数学
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175×42+26×42-42和999×222+333×334的简便计算怎么做?
人气:440 ℃ 时间:2020-02-15 10:50:24
解答
175×42+26×42-42
=(175+26-1)×42
=200×42
=8400
999×222+333×334
=333×666+333×334
=333×(666+334)
=333×1000
=333000
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