2x + 1 2x + 4 x +1 ( x -2 ) · ( x +2 )
E = ------------ +[ ------------------- - --------------------- ] · -------------------------- =
x +1 ( x +1) ·(x +2) ( x +1) ·( x +2 ) ( x +3) · ( x -2 )
2x +1 x + 3 x +2
= ---------------- + ------------------------- · -------------- =
x +1 (x +1 ) ·( x +2 ) x +3
2x +1 1 2x + 2 2 · ( x +1 )
= ------------ + ---------------- = ------------- = ------------------------ = 2
x + 1 x +1 x +1 x +1