Tính:
$\dfrac{\dfrac{\dfrac{1}{2}+\dfrac{1}{3}+\dfrac{1}{4}+\dfrac{1}{5}}{\dfrac{2}3+\dfrac{3}{4}+\dfrac{4}{5}+\dfrac{5}{6}}}{\dfrac{\dfrac{3}2+\dfrac{4}{3}+\dfrac{5}{4}+\dfrac{6}{5}}{\dfrac{3}{4}+\dfrac{4}{7}+\dfrac{7}{10}+\dfrac{10}{13}}}$
Loga
Sinh Học lớp 12
