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Răspuns: [tex]\bf 29+5\sqrt{15}[/tex]
Explicație pas cu pas:
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[tex]\bf 20-(-3\sqrt{3} -5\sqrt{5} )\cdot\sqrt{3} =[/tex]
[tex]\bf 20-(-3\cdot 3 -5\sqrt{5\cdot3} ) =[/tex]
[tex]\bf 20-(-9 -5\sqrt{15} ) =[/tex]
[tex]\bf 20+9+5\sqrt{15} =[/tex]
[tex]\boxed{\bf 29+5\sqrt{15}}[/tex]
[tex]20 - ( - 3 \sqrt{3} - 5 \sqrt{5} ) \times \sqrt{3} = 20 + (3 \sqrt{3} + 5 \sqrt{5} ) \sqrt{3} = 20 + 9 + 5 \sqrt{15} = 2 9 + 5 \sqrt{15} [/tex]