Question

Calculati: a) 3√2- 2√3
b) 4√2- √6
c) 4√6+ √3
d) 18 supra 5√3-12 supra 4√5
Va rog ajutatima!

Answer 1

a)introduci sub radical 
$\sqrt{18} - \sqrt{12}$
si dai in factor 
$\sqrt{6} ( \sqrt{3} - \sqrt{2} )$
c)$\sqrt{3} (4 \sqrt{2} -1)$
b)$\sqrt{2} (4- \sqrt{3} )$
d)$\frac{18}{ \ \frac{5 \sqrt{3}-12 }{4 \sqrt{5} } }$
$\frac{18*4 \sqrt{5} }{5 \sqrt{3}-12 }$
....apoi amplifici cu  $5 \sqrt{3}+12$
si dai in factor ce e de dat (e prea mult de stat ca iti scriu tot)