已知a>c>b,化简la+bl-la-bl+lb-cl+la+cl
问题描述:
已知a>c>b,化简la+bl-la-bl+lb-cl+la+cl
答
a+b-a-b+c-b+a+c
=2c-b+a
已知a>c>b,化简la+bl-la-bl+lb-cl+la+cl
a+b-a-b+c-b+a+c
=2c-b+a