67×39 33×71 33×39 67×71怎么简便运算

2025-03-07 09:32:28
推荐回答(1个)
回答1:

67×39+33×71+33×39+67×71
=67×39+33×39+33×71+67×71
=(67+33)×39+(67+33)×71
=(67+33)×(39+71)
=100×110
=11000