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[不等式] 厚朴杯不等式题

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力工 posted 2021-4-26 08:15 |Read mode
2021年厚朴(Hope)杯不等式题:
已知正数$a,b,c$满足$ab+bc+ca=11$,求$(1+a^2)(1+b^2)(1+c^2)$的最小值。
粗看这题条件,好象三角形的半角正切公式。

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isee posted 2021-4-26 08:16

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facebooker posted 2021-4-26 13:47
回复 1# 力工

确实像 所以考虑$z=a+i$代换

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