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2lg(X-2Y)=lgX+lgYlg(X-2Y)^2=lgXY(X-2Y)^2=XYX^2+4Y^2-4XY-XY=0X^2-5XY+4Y^2=0(X/Y)^2-5(X/Y)+4=0(X/Y-4)(X/Y-1)=0だから:X/Y=1またはX/Y
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