680×56+440×68怎么简便运算?999×222+333×334怎么简便运算?

分类: 作业答案 • 2023-01-11 13:37:00

问题描述：

答

680×56+440×68
=68×560+440×68
=68×(560+440)
=68×1000
=68000
999×222+333×334
=333×3×222+333×334
=333×666+333×334
=333×(666+334)
=333×1000
=333000