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
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