2. Gf intersectat cu Ox ={A,B}
f(x)=0
x^2-3x=0
x(x-3)=0
x1=0 , A(0,0)
x2=3, B(3,0)
3. 1= V(x-1)(x+1)
1= V(x^2-1) ridici totul la 2
x^2-1= 1
x^2= 2
x= V2 sau -V2
4. nr caz posibile = 30
nr caz favorabile =6 ( V0, V1, V4, V9,V16, V25)
P= 6/30= 1/5
5. xG= (xA+xB+xC)/3
3= (3+5+1)/3
9=9 adevarat
yG= (yA+yB+yC)/3
2= (5+k+5+k)/3
2k+10=6
2k= -4
k= -2
6. cos pi/3= cos 60= 1/2
sin pi/6= sin 30= 1/2
1/2+1/2= 2/2=1
