脱式计算:一、用简便方法计算下面各题。(5⼀17×4⼀13)×17×13 = = = =

2024-11-02 19:23:18
推荐回答(2个)
回答1:


20

回答2:

(5/17×4/13)×17×13
=5/17×4/13×17×13
=(5/17×17)×(4/13×13 )
=5×4
=20