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设ak,bk,ck(1≤k≤n)均为正数,则有当且仅当a1/b1=a2/b2=…=an/bn,b1/c1=b2/c2=…=bn/cn,时等号成立.证明记
Let ak, bk, ck (1 ≤ k ≤ n) be positive numbers, then if and only if a1/b1=a2/b2=...=an/bn,b1/c1=b2/c2=...=bn/ Cn, when the equal sign was established.