Question

simplifique a expressão numérica:

$\frac{ \sqrt{7} - \sqrt{5} }{ \sqrt{5} + \sqrt{3} } - \frac{ \sqrt{5} - \sqrt{3} }{ \sqrt{7} + \sqrt{5} }$

Answer 1

(\/7-\/5)*(\/5-\/3)/(5+3) - (\/5-\/3)*(\/7-\/5)*7+5 = 
(\/35+\/15)/8 - (\/35+\/15)/12 = 
mmc (8 e 12) = 24

3(\/35+\/15)/24 - 2(\/35+\/15)/24 = 3\/35+3\/15-2\/35-2\/15 / 24 = 
\/35+\/15 / 24