Question

Vă rog !!! Dau coroana !!!​

Answer 1

Răspuns: $\bf 29+5\sqrt{15}$

Explicație pas cu pas:

Salutare!

$\bf 20-(-3\sqrt{3} -5\sqrt{5} )\cdot\sqrt{3} =$

$\bf 20-(-3\cdot 3 -5\sqrt{5\cdot3} ) =$

$\bf 20-(-9 -5\sqrt{15} ) =$

$\bf 20+9+5\sqrt{15} =$

$\boxed{\bf 29+5\sqrt{15}}$

Answer 2

$20 - ( - 3 \sqrt{3} - 5 \sqrt{5} ) \times \sqrt{3} = 20 + (3 \sqrt{3} + 5 \sqrt{5} ) \sqrt{3} = 20 + 9 + 5 \sqrt{15} = 2 9 + 5 \sqrt{15}$