log以4为底(3的X次方-1)为真数*log以4为底(3x次方-1)/16小于等于3/4
问题描述:
log以4为底(3的X次方-1)为真数*log以4为底(3x次方-1)/16小于等于3/4
答
log以4为底(3的X次方-1)为真数*log以4为底(3x次方-1)/16小于等于3/4=log4(3^x-1)*log4(3^x-1)-2log4(3^x-1)=3/4设a=log4(3^x-1)a^2-2a-3/4=0a=1+/-根号23^x-1=4^(1+/-根号2)x=log3[4^(1+/-根号2)+1]...