Răspuns :
y+2 2y-3 y+2-2y+3 5-y
------- - -------- = ------------------ = ------------
2y+1 2y+1 2y+1 2y+1
------- - -------- = ------------------ = ------------
2y+1 2y+1 2y+1 2y+1
( y + 2) / ( 2 y + 1) - ( 2 y - 3) / ( 2 y + 1) =
= ( y + 2 - 2 y + 3) / ( 2 y + 1) =
= ( 5 - y) /( 2 y + 1)
= ( y + 2 - 2 y + 3) / ( 2 y + 1) =
= ( 5 - y) /( 2 y + 1)