第三章关于减法中“於”的用法的叙述有误

[User670]

减法没有交换律，因此“以”和“於”不等价。

減二以一。書之。 //2-1 = 1
減二於一。書之。 //1-2 = (-1)

03 算術第三.md 第36行 加減乘有交換率者。於通以。可以改一下了。

[Lingdong Huang]

Now fixed: 9824162

Thanks a lot for pointing out! What a silly mistake ;)

[yezhiyi9670]

The website is still wrong so far.

[Lingdong Huang]

@yezhiyi9670 the site is now updated. The automatic site rebuild was not triggered for some reason, so I manually did it. Thanks for pointing out!