首页 > 中学考试杂题 > 题目详情
(log23+lOg427)(log34+log98)= 23中2是底数3是真数,4是底数,3是底数,9是底数(log2
题目内容:
(log23+lOg427)(log34+log98)= 23中2是底数3是真数,4是底数,3是底数,9是底数
(log23+lOg427)(log34+log98)
=(lg3/lg2+lg27/lg4)(lg4/lg3+lg8/lg9)
=(lg3/lg2+3lg3/2lg2)(2lg2/lg3+3lg2/2lg3)
=(5lg3/2lg2)(7lg2/2lg3)
=(5/2)(7/2)
=35/4
为什么
(lg3/lg2+3lg3/2lg2)(2lg2/lg3+3lg2/2lg3)
=(5lg3/2lg2)(7lg2/2lg3) 5哪里来的?
(log23+lOg427)(log34+log98)= 23中2是底数3是真数,4是底数,3是底数,9是底数
(log23+lOg427)(log34+log98)
=(lg3/lg2+lg27/lg4)(lg4/lg3+lg8/lg9)
=(lg3/lg2+3lg3/2lg2)(2lg2/lg3+3lg2/2lg3)
=(5lg3/2lg2)(7lg2/2lg3)
=(5/2)(7/2)
=35/4
为什么
(lg3/lg2+3lg3/2lg2)(2lg2/lg3+3lg2/2lg3)
=(5lg3/2lg2)(7lg2/2lg3) 5哪里来的?
(log23+lOg427)(log34+log98)
=(lg3/lg2+lg27/lg4)(lg4/lg3+lg8/lg9)
=(lg3/lg2+3lg3/2lg2)(2lg2/lg3+3lg2/2lg3)
=(5lg3/2lg2)(7lg2/2lg3)
=(5/2)(7/2)
=35/4
为什么
(lg3/lg2+3lg3/2lg2)(2lg2/lg3+3lg2/2lg3)
=(5lg3/2lg2)(7lg2/2lg3) 5哪里来的?
本题链接: