高一数学对数与对数运算
问题描述：
高一数学对数与对数运算
log2(25)*log3(4)*log5(9) （）里的是真数
答
log2 25*log3 4*log5 9 =log2 5^2*log3 2^2*log5 3^2 =2*log2 5*2*log3 2*2*log5 3 =8*(log2 5)*(log2 2)/(log2 3)*(log2 3)/(log2 5) =8*log2 2 =8*1 =8 或log2(25)*log3(4)*log5(9) =log25/log2 * log4/log3 * log...