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Meilleure réponse !
2012-11-23T19:07:09+01:00

II 2) 4\sqrt{2} -12\sqrt{2} + 15\sqrt{2} = 7\sqrt{2}

II 4) \frac{2\sqrt{2}}{\sqrt{21}}.\frac{21\sqrt{2}}{-5}.\frac{-2}{3\sqrt{7}} = \frac{-8}{5}

IV\frac{2\sqrt{3}-7}{5\sqrt{2}}=\frac{2\sqrt{6}-7\sqrt{2}}{10}}

V 3x²-15+7=x²-9

2x²=-1 impossible