化简25^(1/3log以5为底 27的对数+log以125为底8的对数)

问题描述:

化简25^(1/3log以5为底 27的对数+log以125为底8的对数)

36

9+log以125为底8的对数

原式=25^[log(125)27+log(125)8]
=25^[log(125)27*8]
=25^[3log(125)3*2]
=25^[3*(1/3)log(5)6]
=25^[log(5)6]
=25^[2log(25)6]
=25^[log(25)36]
=36

1/3log以5为底 27的对数=log以5为底3的对数
log以125为底8的对数=log以5为底2的对数
log以5为底2的对数+log以5为底3的对数=log以5为底6的对数
25^(1/3log以5为底 27的对数+log以125为底8的对数)=根6