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Calculati:
a) 5√2/3√3 - √3/√2=
b) 3√5/2√3 + 4√3/√5=
c) 4√5/3√2 - √2/3√5=


Răspuns :


a) [tex]\dfrac{5\sqrt{2}}{3\sqrt{3}}[/tex]-[tex]\dfrac{\sqrt{3}}{\sqrt{2}}[/tex]

[tex]\dfrac{5\sqrt{6}}{9}[/tex]-[tex]\dfrac{\sqrt{6}}{2}[/tex]=[tex]\dfrac{5\sqrt{6}-9\sqrt{6}}{18}[/tex]=[tex]\dfrac{-4\sqrt{6}}{18}[/tex]

=>[tex]\dfrac{-2\sqrt{6}}{9}[/tex]

b) [tex]\dfrac{3\sqrt{5}}{2\sqrt{3}}[/tex]+[tex]\dfrac{4\sqrt{3}}{\sqrt{5}}[/tex]

[tex]\dfrac{3\sqrt{15}}{6}[/tex]+[tex]\dfrac{4\sqrt{15}}{5}[/tex]=[tex]\dfrac{\sqrt{5}}{2}[/tex]+[tex]\dfrac{4\sqrt{15}}{5}[/tex]

=[tex]\dfrac{5\sqrt{15}+8\sqrt{15}}{10}[/tex]=[tex]\dfrac{13\sqrt{15}}{10}[/tex]

c) [tex]\dfrac{4\sqrt{5}}{3\sqrt{2}}[/tex]-[tex]\dfrac{\sqrt{2}}{3\sqrt{5}}[/tex]

[tex]\dfrac{4\cdot 5}{15}[/tex]-[tex]\dfrac{\sqrt{10}}{15}[/tex]=[tex]\dfrac{20- \sqrt{10}}{15}[/tex]