Question

tính nhanh

Answer 1

\(B=\dfrac{\dfrac{5-10\sqrt{2}+6\sqrt{2}}{70}\cdot\left(-\dfrac{4}{15}\right)}{\dfrac{5+6\sqrt{2}-10\sqrt{2}}{50}\cdot\dfrac{5}{7}}=\dfrac{10-8\sqrt{2}}{525}:\dfrac{5-4\sqrt{2}}{70}\\ B=\dfrac{2\left(5-4\sqrt{2}\right)}{525}\cdot\dfrac{70}{5-4\sqrt{2}}=\dfrac{4}{15}\)