设log2^5=m,log5^7=n,则log2^7=?
问题描述:
设log2^5=m,log5^7=n,则log2^7=?
答
log2^7=[log2^5]×[log5^7]=mn对数换底公式:log(a)[N]=[log(b)^N]除以[log(b)^a]
设log2^5=m,log5^7=n,则log2^7=?
log2^7=[log2^5]×[log5^7]=mn对数换底公式:log(a)[N]=[log(b)^N]除以[log(b)^a]