log(2.5)6.25 -log(5)8log(16)125-lg4-lg25求过程答案

log(2.5)6.25 -log(5)8log(16)125-lg4-lg25
=log2.5(2.5)^2--log5(2)^3*log(2)^4(5)^3-(lg(4*lg25)
=2-9/4[log5(2)*log2(5)]-2(lg(10)
=2-9/4[2/log2(5)*log2(5)]-2
=-9/4