✨ Best Answer ✨
a+b+c=1/2a×2+1/2b×2+1/2c×2
=(1/2a+1/2b)+(1/2b+1/2c)+(1/2c+1/2a)
=1/2(a+b)+1/2(b+c)+1/2(c+a)
として、３つの部分ごとに相加平均と相乗平均の関係を適用します
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