㏒10(x)+㏒10(y)=2㏒10(x-2y).求以根号2为底,x/y的对数
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㏒10(x)+㏒10(y)=2㏒10(x-2y).求以根号2为底,x/y的对数
㏒10(x)+㏒10(y)=2㏒10(x-2y).求以根号2为底,x/y的对数
㏒10(x)+㏒10(y)=2㏒10(x-2y).求以根号2为底,x/y的对数
㏒10(x)+㏒10(y)=2㏒10(x-2y).
化为:㏒10(xy)=㏒10(x-2y)²
∴xy=(x-2y)²
∴x²-5xy+y²=0
解得 x/y=(5±√21)/2
∴㏒√2(x/y)=㏒√2[(5±√21)/2]
答案: 0,2。 具体解答解图片,点击放大,荧屏放大再放大: