neverland

Note (2020-02-06 09:47)

Please be advised that the following was written or last updated a while ago and may therefore contain outdated information or opinions I no longer hold. 请知悉下文自写作或上次更新已届相当时限，或包含过时信息及已摒弃观点。

我没有理解错这篇吧，意思是教美国学生记住抛物线对称轴是 x = -b / 2a 就可以上新闻的[费解] 那王后雄是不是可以天天上新闻了

| This Professor’s ‘Amazing’ Trick Makes Quadratic Equations Easier - The New York Times https://www.nytimes.com/2020/02/05/science/quadratic-equations-algebra.html