读万卷书，行万里路。读书破万卷，下笔如有神。读一书，长一智。
(a + b - c)^(2 m) (a - b - c)^(2 m + 1) (c - a - b)^(4 m + 3) (c + b - a)^(m + 1)=(a - b - c)^(2 + 2 m) (a + b - c)^(3 + 2 m) (-a - b + c)^( 4 m) (-a + b + c)^m
