问题 解答题

320+330+340+350=______×______.

答案

320+330+340+350,

=(335-15)+(335-5)+(335+5)+(335+15),

=(335+335+335+335)+(5-5+15-15),

=335+335+335+335,

=335×4.

故答案为:335,4.

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