由题意得
a^(lga-0.5)=根号10
两边取对数得
(lga-0.5)*lga=0.5
lg^2a-0.5lga-0.5=0
2lg^2a-lga-1=0
(2lga+1)(lga-1)=0
2lga+1=0
得lga=-1/2
a1=1/(根号10)
lga-1
得a2=10
由题意得
a^(lga-0.5)=根号10
两边取对数得
(lga-0.5)*lga=0.5
lg^2a-0.5lga-0.5=0
2lg^2a-lga-1=0
(2lga+1)(lga-1)=0
2lga+1=0
得lga=-1/2
a1=1/(根号10)
lga-1
得a2=10