Sagot :
Bonjour,
Exo 1
a)[tex]\sqrt{2}+\sqrt{8}+\sqrt{18} = \sqrt{2}+2\sqrt{2}+3\sqrt{2} = 6\sqrt{2}[/tex]
b)[tex]13\sqrt{2}+4\sqrt{50}-\sqrt{162} = 13\sqrt{2}+20\sqrt{2}-9\sqrt{2} = 24\sqrt{2}[/tex]
Exo 2
a)[tex]\sqrt{3}-\sqrt{12}+\sqrt{27} = \sqrt{3} - 2\sqrt{3}+3\sqrt{3} = 2\sqrt{3}[/tex]
b)[tex]\sqrt{20}-\sqrt{45}+\sqrt{5} = 2\sqrt{5}-3\sqrt{5}+\sqrt{5} = 0[/tex]
Exo 3
a)[tex]\left(\sqrt{3}+\sqrt{5}\right)^2 = 3+2\sqrt{15}+5 = 8+2\sqrt{15}[/tex]
b)[tex]\left(\sqrt{3}-\sqrt{5}\right)\left(\sqrt{3}+\sqrt{5}\right) = 3-5 = -2[/tex]
c)[tex]\left(\sqrt{5}-\sqrt{3}\right)^2 = 3-2\sqrt{15}+5 = 8-2\sqrt{15}[/tex]
d)[tex]\left(\sqrt{5}-\sqrt{3}\right)\left(\sqrt{3}+\sqrt{5}\right) = 5-3 = 2[/tex]