When a > 0, b > 0 and a ≠ B, compare the size of a ^ a × B ^ B and a ^ B × B ^ a
If B < 0, then compare the size of - A, - A-B, - A + B, what is the conclusion?
-a-b>-a>-a+b
If a < 0, B > 0, and a + B < 0, compare the sizes of a, B, - A, - B, A-B, B-A, and connect them with < 0
a-b<a<-b<b<-a