Răspuns:
Explicație pas cu pas:
1.
E(x)=(x²+1)/(2x-1)
E(3)=(9+1)/(6-1)=10/5=2
2.
E(a)=3a/(a-4) a∈R\{4}
3
F(x)=(x²-9)/3(x+3)=(x-3)/3 se simplifica cu (x+3)
F(0)=-3/3=-1
F(3) =0 F(0)<F(3)
4.
a)(x-3)(2x+1)/(2x-1)(2x+1)=(2x²-5x-3)/(4x²-1)
b) E(x)=(x+1)²/(x-1)(x+1)=(x+1)/(x-1)
x²+2x+1=(x+1)² si (x²-1)=(x-1)(x+1)
