Question

12 supra radical 3
15 supra 5 radical 3
21 supra 7 radical 3
18 supra radical 3

Answer 1

Se rationalizeaza numitorii, adica se inmulteste fractia cu radicalul (fara coeficientul aflat inaintea lui) aflat la numitor (sub linia de fractie).
$\frac{12}{ \sqrt{3} } = \frac{12 \sqrt{3} }{3} =4 \sqrt{3}$
$\frac{15}{5 \sqrt{3} } = \frac{15 \sqrt{3} }{(5*3)} = \frac{15 \sqrt{3} }{15} = \sqrt{3}$
$\frac{21}{7 \sqrt{3} } = \frac{21 \sqrt{3} }{21} = \sqrt{3}$
$\frac{18}{ \sqrt{3} } = \frac{18 \sqrt{3} }{3} =6 \sqrt{3}$