Toán Lớp 9: $\sqrt{\frac{3-\sqrt{5}}{3+\sqrt{5}}}$
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Toán Lớp 9: $\sqrt{\frac{3-\sqrt{5}}{3+\sqrt{5}}}$
Comments ( 2 )
=sqrt{((3-sqrt{5}).(3-sqrt{5}))/((3+sqrt{5}).(3-sqrt{5}):}
=sqrt{(3-sqrt{5})^2/(9-5)}
=sqrt{(3-sqrt{5})^2/(4)}
=(sqrt{(3-sqrt{5})^2})/sqrt{4}
=(|3-sqrt{5}|)/2
=(3-sqrt{5})/2 ( vì sqrt{9}>sqrt{5})