175×42+26×42-42和999×222+333×334的简便计算怎么做?

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175×42+26×42-42和999×222+333×334的简便计算怎么做?
175×42+26×42-42和999×222+333×334的简便计算怎么做?

175×42+26×42-42和999×222+333×334的简便计算怎么做?
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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