Răspunsuri

2014-06-17T14:06:40+03:00
Ecuatia de grd II functie de radacini are forma x²-sx+p=0
s=x₁+x₂
p=x₁*x₂
1. x₁=√2, x₂=√3
2. x₁=2, x₂=√3
3. x₁=x₂=√7
4. x₁=x₂=√5
5. 
0,91(6)=916-91/900=825/900=11/12
2,8(6)=286-28/90=258/90=43/15
x²-43x/15+11/12=0  I*60
60x²-172x+55=0
Δ=172²-4*60*55=16384
√Δ=128
x₁=172+128/120=5/2
x₂=172-128/120=11/30
2 5 2