Răspuns:
7) Prin simplificare:
21/14= 3/2
8) 4/7+2/7=6/7
[tex]\it 7)\ \ \dfrac{\ 21^{(7}}{14}=\dfrac{3}{2}\\ \\ \\ 8)\ \ \dfrac{4}{7}+\dfrac{2}{7}=\dfrac{4+2}{7}=\dfrac{6}{7}[/tex]
