👤

Sagot :

XXX102

Bonsoir,

 

[tex]A = \frac{7}{\sqrt{5}-2} - \frac{7}{\sqrt{5}+2}\\ =\frac{7(\sqrt{5}+2)-7(\sqrt{5}-2)}{(\sqrt{5}-2)(\sqrt{5}+2)}\\ =\frac{7\left[(\sqrt{5}+2)-(\sqrt{5}-2)\right]}{5-4}\\ =\frac{7 \times 4}{1} = 28\\[/tex]

© 2024 IDNLearn. All rights reserved.