2log5(25)-3log2(64)

问题描述:

2log5(25)-3log2(64)
如题`怎么做?

2log5(25)-3log2(64)
=2log5(5^2)-3log2(2^6)
=2*2log5(5)-3*6log2(2)
=4*1-18*1
=-14