用简便运算计算399x9+399

用简便运算计算399x9+399
2024-12-28 14:27:57
推荐回答(4个)
回答1:

399×9+399
=399×(9+1)
=399×10
=3990

回答2:

399*(9+1)=399*10=3990

回答3:


如图

回答4:

用简便运算计算399x9+399
=399x(9+1)
=399x10
=3990