Răspuns:
Explicație pas cu pas:
1
P(X)+X²-5X+7=3X²+2X-1
P(X)=3X²+2X-1-X²+5X-7=2X²+7X-8
6.
E(X)=[3/(X-2)-2/(X+2)-10/(X²-4)]·(X-2)²/X=(3X+6-2X+4-10)/(X²-4)·(X-2)²/X=
=X/(X-2)(X+2)·(X-2)²/X=(X-2)/(X+2)
