也不能說是國內教育的問題，國外還不是一樣吵成一團...

根據這個數學教學的網站
http://www.purplemath.com/modules/orderops2.htm
下面就有提到：
And please do not send me an e-mail either asking for or else proffering a definitive verdict on this issue. As far as I know, there is no such final verdict. And telling me to do this your way will not solve the issue!
(作者的resume： http://www.purplemath.com/resume.htm )

我想這個爭論應該也是行之有年了，他才會特別寫出來，

如果有人斬釘截鐵說某個答案才是對的，才是教育出了問題...