小明做得对吗？小明是个聪明勤奋的好孩子。

这段时间，他学习了“商不变的性质”，感到很高兴，因为有些题如果应用这种规律来做，会非常简便和轻松！这天，小明在计算900÷40时想，因为900÷40＝90÷4，而90÷4＝22……2，所以900÷40＝22……2。

“这样做，真是太快了！”小明兴奋地想。

同学们，你认为他做得 对吗？

推荐阅读：
How will Blogging Change after the Pandemic?　 Digital Relationships: 5 Tips For Building A Better Veterinary B　 The 2020 Pandemic Further Boosts Earnings and Influence of Blogg　 What to Do When Your Blog Gets Too Big for You Alone　 Minimum Numbers of Function Calls to Make Target Array　 Harddrives will fail – it is just a matter of when　 Bruteforce/DFS/Backtracking Algorithm using Javascript to Solve 　 DFS and BFS Algorithm to Find Numbers With Same Consecutive Diff　 How to Remove Items/Entries with Specific Values from Map/HashMa　 Find the Real Root of 4^x + 6^x = 9^x