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[几何] 三角形面积最小值

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敬畏数学 posted 2018-9-24 22:39 |Read mode
三角形ABC的面积为2,角A,B,C对边分别为a,b,c,则$a^2+2b^2+3c^2$的最小值——————?

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kuing posted 2018-9-24 23:35

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original poster 敬畏数学 posted 2018-9-25 09:09
Last edited by 敬畏数学 2018-9-25 12:10到两定点的距离线性平方和为常数,则此定点的轨迹为圆!以前只有注意系数相等,现在可以推广啦!哈哈!更牛的结论。$ma^2+nb^2+pc^2=t,m,n,p,t>0$,则有:$ s\leqslant \frac{t}{4\sqrt{(n+p)m+np}} $,证法如此之多,对诸位神表示服了。暂且称为“广义”阿波罗尼奥斯定理“”。

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