高中数学，求大神解释

显示全部楼层 · 2012-7-23 15:44:25

选择B∵x，y，z都是大于1的正数，m＞0，且log（x）m＝24，log（y）m＝40，log（xyz）m＝12∴log（m）x=1/24,log（m）y=1/40,log(m)xyz=1/12log(m)xyz=log（m）x+log（m）y+log（m）z∴log（m）z=1/60∴log（z）m=60...

千问 · 2012-7-23 15:44:25

根据已知有：log(m)x=1/24，log(m)y=1/40，log(m)xyz=1/12所以：log(m)xyz-log(m)x-log(m)y=log(m)y=1/12-1/24-1/40=1/60...

千问 · 2012-7-23 15:44:25

由题意得log(m)x=1/24，log(m)y=1/40，log(m)xyz=1/12所以log(m)xyz-log(m)x-log(m)y=log(m)y=1/12-1/24-1/40=1/60 log(y)m=60...