已知2的x次方等于9,2的y次方=8/3,则x+2y=

问题描述:

已知2的x次方等于9,2的y次方=8/3,则x+2y=

2∧x=9 x=log?92∧y=8/3 y=log?﹙8/3﹚x+2y=log?9+2log?﹙8/3﹚=log?9+log?﹙8/3﹚2=log?[9×﹙8/3﹚2]=log?82=6