log5[log4(log3 81)]=0
问题描述:
log5[log4(log3 81)]=0
答
求值
log5[log4(log3 x)]=0
解方程
log4(log3 x)=5^0=1
log₃x=4¹=4
x=3⁴=81
证明:
log5[log4(log3 81)]
log5[log₄4]
=log5(1)
=0