[tex](4 \sqrt{2} - \sqrt{30} ) (4 \sqrt{2} + \sqrt{30} ) - 3( \sqrt{5} + 1) {}^{2} [/tex]
[tex]4 \times ( \sqrt{3} + 1) {}^{2} - \sqrt{3} \times (8 - \sqrt{3} ) - ( \sqrt{21} - \sqrt{2} )( \sqrt{21} + \sqrt{2} )[/tex]
Formula de calcul prescurtat va rog​