1. media aritmetica : (a+b)/2=(8+4)/2=12/2=6
3. [tex] \sqrt{x+4} =2 [/tex] ridic la patrat si obtin:
x+4=4=> x=0
4. submultimile de 2 elemente sunt: {2,4}, {2,6}, {2,8}, {4,6}, {4,8} {6,8}
Adica 6 submultimi
5.
6. teorema cosinusului :
[tex] AC^{2} = AB^{2} + BC^{2} - 2*AB*BC*cos(B)[/tex]
introdu datele si calculeaza cos B
