39*52 = 2028
48*39 = 18721872 - 960000 = -958128
12732 = 40642732 = 8644064 - 864 = 3200
-958128 / 3200 = -299.415
Therefore, the final answer is -299.415.
39*52 = 2028
48*39 = 1872
1872 - 960000 = -958128
12732 = 4064
2732 = 864
4064 - 864 = 3200
-958128 / 3200 = -299.415
Therefore, the final answer is -299.415.