(1/3a+1/4b+1/5c)^2-(2/3a-1/4b-1/5c)^2 怎么解
问题描述:
(1/3a+1/4b+1/5c)^2-(2/3a-1/4b-1/5c)^2 怎么解
答
(1/3a+1/4b+1/5c)^2-(2/3a-1/4b-1/5c)^2
=(1/3a+1/4b+1/5c+2/3a-1/4b-1/5c)(1/3a+1/4b+1/5c-2/3a+1/4b+1/5c)
=a(-1/3a+1/2b+2/5c)