Question

(2/(√8-√9))-((2*√8)/(8-9))

Answer 1

Ответ:

вот так

-6

===================

Answer 2

***

$\left(\frac{2}{\sqrt{p}-\sqrt{q}}\right)-\left(\frac{2\sqrt{p}}{p-q}\right)$  

$p= 8\\q=9$

решение:

подставляем значения p и q,

и решаем:

$\displaystyle \bf \left(\frac{2}{\sqrt{8}-\sqrt{9}}\right)-\left(\frac{2\sqrt{8}}{8-9}\right)=\frac {2}{\sqrt 8 - \sqrt 9 }-\frac {2\sqrt 8}{8-9}=$

________________________________________

• $\displaystyle \bf \frac{2}{\sqrt{8}-\sqrt{9}}=\frac{2\left(\sqrt{8}+\sqrt{9}\right)}{\left(\sqrt{8}-\sqrt{9}\right)\left(\sqrt{8}+\sqrt{9}\right)}=\frac{4\sqrt{2}+6}{-1}=-4\sqrt{2}-6$

• $\diplaystyle \bf \frac{2\sqrt{8}}{8-9}=\frac{4\sqrt 2}{-1} =-4\sqrt 2$

________________________________________

$\diplaystyle \bf =-4\sqrt{2}-6-\left(-4\sqrt{2}\right)=-4\sqrt{2}-6+4\sqrt{2}=-6$

ответ: -6