Răspuns:
1) 3.55849
2)9.35396
3)3.76379
Explicație pas cu pas:
1)[tex]\frac{\left(\sqrt{20}+\sqrt{7}\right)}{2}=\frac{\sqrt{2^{2}\cdot5}+\sqrt{7}}{2}=\frac{2\sqrt{5}+\sqrt{7}}{2}=3.55894[/tex]
2)[tex]\frac{2\sqrt{45}+2\sqrt{7}}{2}=\frac{6\sqrt{5}+2\sqrt{7}}{2}=\frac{2\left(3\sqrt{5}+\sqrt{7}\right)}{2}=3\sqrt{5}+\sqrt{7}[/tex]=9.35396
3) [tex]\frac{\sqrt{5}+\sqrt{28}}{2}=\frac{\sqrt{5}+\sqrt{2^{2}\cdot7}}{2}=\frac{\sqrt{5}+\sqrt{2^{2}}\sqrt{7}}{2}=\frac{\sqrt{5}+2\sqrt{7}}{2}=3.76379[/tex]
