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original poster: isee

[几何] 2017年理科课标全国卷II 第12题向量积最小

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original poster isee posted 2017-6-11 00:10

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可以更顺爽——
\begin{align*}
\vv {PA}\cdot (\vv {PB}+\vv {PC})&=2\vv {PA}\cdot \vv {P ...
色k 发表于 2017-6-10 23:38

这不等式玩得真溜。。。。。。爽歪歪。。

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zhcosin posted 2017-6-11 10:26

回复 20# 色k
这酸爽，才正宗。。。。

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