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這兩個數相比得: [2S/(V1+V2)][2V1V2/S(V1+V2)] =4V1V2/(V1+V2)^2=4V1V2/[(V1-V2)^2+4V1V2] 當V1=V2時,因為上述比值等於1,所以這兩個數相等 當V1≠V2時,因為上述比值小於1,所以第一個數小於第二個數
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