Question

Tính giá trị biểu thức 1/2 : 5/6 : 7/8 + 3 : 7 : 5/9

Answer 1

\(=\dfrac{1}{2}\cdot\dfrac{6}{5}\cdot\dfrac{8}{7}+\dfrac{3}{7}\cdot\dfrac{9}{5}=\dfrac{24}{35}+\dfrac{27}{35}=\dfrac{51}{35}\)