bjr
(2 + 1/2)³ - 1/(1 - 3)² =
(4/2 + 1/2)³ - 1/(-2)² =
(5/2)³ - 1/4 =
5³/2³ - 1/4 =
125/8 - 1/4 =
125/8 - 2/8 =
(125 - 2)/ 8 =
123/8
