12 abr 2017, 11:45
\(\frac{3\sqrt{5}-\sqrt{3}}{2\sqrt{5}-3\sqrt{3}}\)
sol:
A) \(-3-\sqrt{15}\)
B) \(2\sqrt{5}+3\sqrt{15}\)
C) \(3-\sqrt{15}\)
D) \(-2\sqrt{5}-3\sqrt{15}\)
13 abr 2017, 02:03
\(\frac{3\sqrt{5}-\sqrt{3}}{2\sqrt{5}-3\sqrt{3}}.\frac{2\sqrt{5}+3\sqrt{3}}{2\sqrt{5}+3\sqrt{3}}=
\frac{7\sqrt{15}+21}{-7}=
-3-\sqrt{15}\)
14 abr 2017, 11:38
jorgeluis Escreveu:\(\frac{3\sqrt{5}-\sqrt{3}}{2\sqrt{5}-3\sqrt{3}}.\frac{2\sqrt{5}+3\sqrt{3}}{2\sqrt{5}+3\sqrt{3}}=
\frac{7\sqrt{15}+21}{-7}=
-3-\sqrt{15}\)
não consigo perceber é por que facto vez a ultiplicação \(\frac{2\sqrt{5}+3\sqrt{3}}{2\sqrt{5}+3\sqrt{3}}\) ?
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