利用换底公式求值.log2(25)×log3(4)×log5(9)

问题描述:

利用换底公式求值.log2(25)×log3(4)×log5(9)

=2log2(5)*2log3(2)*2log5(3)
=2log3(5)/log3(2)*2log3(2)*2log5(3)
=8log3(5)*log5(3)
=8log5(5)/log5(3)*log5(3)=8