Réponses

2012-12-28T17:57:29+01:00

\frac{5}{\sqrt{7}}=\frac{5.\sqrt{7}}{\sqrt{7}.\sqrt{7}}= \frac{5.\sqrt{7}}{7}

\frac{3}{6\sqrt{2}}= \frac{1}{2\sqrt{2}}=\frac{\sqrt{2}}{2.2}=\frac{\sqrt{2}}{4}\frac{2\sqrt{3}}{5\sqrt{2}}=\frac{2.\sqrt{3}.\sqrt{2}}{5.2}=\frac{\sqrt{6}}{5}

\frac{3+\sqrt{2}}{\sqrt{2}}=\frac{(3+\sqrt{2}).\sqrt{2}}{\sqrt{2}.\sqrt{2}} = \frac{3\sqrt{2}+2}{2}

f(-2) = (-6+1/3)/2 = -17/6

f(2/5) = (6/5+1/3)/2 = 23/30

2012-12-28T18:55:24+01:00

daniel ta donner les reponse avec les detail je peu pa faire mieux que lui