若loga(x^2+1)+loga(y^+4)=loga(8)+loga(x)+loga(y),则loga(8xy)=若loga(x^2+1)+loga(y^2+4)=loga(8)+loga(x)+loga(y),则loga(8xy)=

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若loga(x^2+1)+loga(y^+4)=loga(8)+loga(x)+loga(y),则loga(8xy)=若loga(x^2+1)+loga(y^2+4)=loga(8)+loga(x)+loga(y),则loga(8xy)=

若loga(x^2+1)+loga(y^+4)=loga(8)+loga(x)+loga(y),则loga(8xy)=若loga(x^2+1)+loga(y^2+4)=loga(8)+loga(x)+loga(y),则loga(8xy)=
若loga(x^2+1)+loga(y^+4)=loga(8)+loga(x)+loga(y),则loga(8xy)=
若loga(x^2+1)+loga(y^2+4)=loga(8)+loga(x)+loga(y),则loga(8xy)=

若loga(x^2+1)+loga(y^+4)=loga(8)+loga(x)+loga(y),则loga(8xy)=若loga(x^2+1)+loga(y^2+4)=loga(8)+loga(x)+loga(y),则loga(8xy)=
根据题目可知,x,y>0
左边可以化为loga[(x^2+1)(y^2+4)]
右边可以化为loga(8xy)
即,loga[(x^2+1)(y^2+4)]=loga(8xy)
→(x^2+1)(y^2+4)=8xy整理得x²y²+4x²-8xy+y²+4=(xy-2)²+(2x-y)²=0
→x=2,y=1代入得
loga(8xy)=4·loga(2)