(1/3a+1/4b+1/5c)^2-(2/3a-1/4b-1/5c)^2 怎么解_数学解答

(1/3a+1/4b+1/5c)^2-(2/3a-1/4b-1/5c)^2 怎么解

人气：233 ℃　时间：2019-12-17 10:55:21

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)