-(-3a-2b+2c)-{-a+[4a-(a-b-c)-3a]+2c}
问题描述:
-(-3a-2b+2c)-{-a+[4a-(a-b-c)-3a]+2c}
答
-(-3a-2b+2c)-{-a+[4a-(a-b-c)-3a]+2c}
=3a+2b-2c+a-4a+a+b+c-3a-2c
=-3a+3b-3c