2log以5为底10+log以5为底0.25

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2log以5为底10+log以5为底0.25
2log以5为底10+log以5为底0.25

2log以5为底10+log以5为底0.25
2log5(10)+log5(0.25)
=2log5(2*5)+log5(1/4)
=2[log5(2)+1]-log5(2^2)
=2lo5(2)+2-2log5(2)
=2

2log5 10+log5 0.25
= log5 10^2+ log5 0.25
= log5(10^2×0.25)
= log5 25=2