Răspuns:
{4a^2 - 9b^2 =72
{2a+3b=
[tex]6 \sqrt{3} [/tex]
[tex] = > [/tex]
{4a^2 - 9b^2 =72
{a=
[tex]3 \sqrt{3} - \frac{3}{2} b[/tex]
=>
[tex]4(3 \sqrt{3} - \frac{3}{2} b) {}^{2} - 9b {}^{2} = 72 = > b = \frac{ \sqrt{3} }{3} [/tex]
[tex]a = 3 \sqrt{3} - \frac{3}{2} \times \frac{ \sqrt{3} }{3} = > a = \frac{5 \sqrt{3} }{2} [/tex]
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