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[几何] 兔槽:三角形角平分线长为1

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realnumber posted 2021-3-20 22:14 |Read mode
Last edited by realnumber 2021-3-20 22:22三角形ABC,三角对应的三边为a,b,c,C=$\frac{2\pi}{3}$,角C的内角平分线交AB于D,CD=1,则ab的最小值是______.

又一个坑,内角平分线长$\frac{2ab}{a+b}\cos{\frac{C}{2}}$,
县教研员已在最近的高三复习会议上说"二级结论(解答题)直接用".\
另外听说重点中学的课堂上补充了n多各类结.

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色k posted 2021-3-20 22:21

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isee posted 2021-3-20 23:13
回复 2# 色k

楼主可能忘记了,像我,会忘记一些经典不等式一样儿

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original poster realnumber posted 2021-3-20 23:17
回复 2# 色k


    水平似乎就没提高过

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