The second part: Fractional equation which can be decomposed into one-dimensional linear equation.
http://www . 1230 . org/Soft/34443/hsbx/KD 9904/200703/ 15269 . html
Part 3: Linear Functions
http://www . 1230 . org/Soft/34443/hsbx/hs 032/200703/ 15337 . html
The fourth copy:
http://www . 1230 . org/Soft/34443/hsbx/hs 032/200703/ 15526 . html
In other subsequent expectation, .......