Răspuns:
[tex]19 \sqrt{3} [/tex]
Explicație pas cu pas:
[tex](2 \sqrt{6} )( \sqrt{8} + \sqrt{18} ) + (3 \sqrt{15} ) \div ( \sqrt{45} - 3 \sqrt{20} ) = \\ [/tex]
[tex]2 \sqrt{6} (2 \sqrt{2} + 3 \sqrt{2} ) + (3 \sqrt{15} ) \div (3 \sqrt{15}) \div (3 \sqrt{5} - 6 \sqrt{5} ) \\ [/tex]
[tex]2 \sqrt{6} \times 5 \sqrt{2} + (3 \sqrt{15} ) \div ( - 3 \sqrt{5} )[/tex]
[tex]10 \sqrt{12} - \sqrt{3} [/tex]
[tex]20 \sqrt{3} - \sqrt{3} = (20 - 1) \sqrt{3} [/tex]
[tex] = 19 \sqrt{3} [/tex]
