Răspuns :
Explicație pas cu pas:
[tex]m_{a} = \frac{a + b}{2} = \frac{ \sqrt{125} - 3 \sqrt{50} + 3 \sqrt{5} + \sqrt{80} }{2} = \\ = \frac{5 \sqrt{5} - 15 \sqrt{2} + 3 \sqrt{5} + 4 \sqrt{5} }{2} = \bf \frac{12 \sqrt{5} - 15 \sqrt{2} }{2} [/tex]
Explicație pas cu pas:
[tex]m_{a} = \frac{a + b}{2} = \frac{ \sqrt{125} - 3 \sqrt{50} + 3 \sqrt{5} + \sqrt{80} }{2} = \\ = \frac{5 \sqrt{5} - 15 \sqrt{2} + 3 \sqrt{5} + 4 \sqrt{5} }{2} = \bf \frac{12 \sqrt{5} - 15 \sqrt{2} }{2} [/tex]