计算:log3 4·log4 5·log5 6…log80 81=
问题描述:
计算:log3 4·log4 5·log5 6…log80 81=
答
运用换底公式得:
原式=lg4/lg3 *lg5/lg4 *lg6/lg5 *...*lg81/lg80
=lg81/lg3
=4lg3/lg3
=4