Question

Ex 3, dau coroana, aveti mai sus poza

Ratinalizati numitorii si apoi calculati

Answer 1

Răspuns: Ai rezolvarea mai jos

Explicație pas cu pas:

Salutare!

a)

$\bf \dfrac{7}{2\sqrt{3} }- \dfrac{8}{3\sqrt{3} }=$

$\bf \dfrac{7\cdot\sqrt{3}}{2\sqrt{3}\cdot\sqrt{3} }- \dfrac{8\cdot\sqrt{3}}{3\sqrt{3}\cdot\sqrt{3}}=$

$\bf \dfrac{7\sqrt{3}}{2\cdot 3 }- \dfrac{8\sqrt{3}}{3\cdot3}=$

$\bf \dfrac{7\sqrt{3}}{6 }- \dfrac{8\sqrt{3}}{9}=$

$\bf \dfrac{7\cdot3\sqrt{3}-2\cdot 8\sqrt{3}}{18} =$

$\bf \dfrac{21\sqrt{3}-16\sqrt{3}}{18} =$

$\boxed{\bf \dfrac{5\sqrt{3}}{18}}$

b)

$\bf \dfrac{\sqrt{5}-\sqrt{2} }{\sqrt{10} }=\dfrac{\sqrt{5}-\sqrt{2} }{\sqrt{10} }\cdot \bf \dfrac{\sqrt{10}}{\sqrt{10} }= \dfrac{(\sqrt{5}-\sqrt{2})\cdot\sqrt{10}}{\sqrt{10}\cdot{\sqrt{10} }}= \dfrac{\sqrt{50}-\sqrt{20} }{10}=\dfrac{5\sqrt{2}-2\sqrt{5} }{10}=$

$\boxed{\bf \dfrac{5\sqrt{2}-2\sqrt{5} }{10}}$

⊱─────✧pav38✧─────⊰

Answer 2

Răspuns:

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Explicație pas cu pas:

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