1)∵2^x=5^y=10^z
∴ xln2=yln5=zln10
∴1/x+1/y=(ln2/ln10+ln5/ln10)/y=1/y.
2).
3)∵loga(y)loga(x)=loga(x)loga(y)
∴ loga(x^loga(y))=loga(y^loga(x))
∴ x^loga(y)=y^loga(x).
1)∵2^x=5^y=10^z
∴ xln2=yln5=zln10
∴1/x+1/y=(ln2/ln10+ln5/ln10)/y=1/y.
2).
3)∵loga(y)loga(x)=loga(x)loga(y)
∴ loga(x^loga(y))=loga(y^loga(x))
∴ x^loga(y)=y^loga(x).