Răspuns :
[tex]a = 2(8 + \sqrt{18} ) - 3(4 + \sqrt{8} )[/tex]
[tex]a = 2(8 + 3 \sqrt{2} ) - 3(4 + 2 \sqrt{2} )[/tex]
[tex]a = 16 + 6 \sqrt{2} - 12 - 6 \sqrt{2} [/tex]
[tex]a = 16 - 12 + 6 \sqrt{2} - 6 \sqrt{2} [/tex]
[tex]a = 4 [/tex]
[tex]a = 2(8 + \sqrt{18} ) - 3(4 + \sqrt{8} )[/tex]
[tex]a = 2(8 + 3 \sqrt{2} ) - 3(4 + 2 \sqrt{2} )[/tex]
[tex]a = 16 + 6 \sqrt{2} - 12 - 6 \sqrt{2} [/tex]
[tex]a = 16 - 12 + 6 \sqrt{2} - 6 \sqrt{2} [/tex]
[tex]a = 4 [/tex]