b, $\frac{\frac{8}{11}-\frac{2}{9}-\frac{8}{47}}{\frac{-6}{11}+\frac{1}{6}+\frac{6}{47}}$
c, $\frac{3}{8}$ + $\frac{3}{27}$ + $\frac{3}{48}$ + $\frac{3}{80}$
d, $\frac{5}{10}$ + $\frac{5}{40}$ + $\frac{5}{88}$ + $\frac{5}{154}$
Loga
Sinh Học lớp 12
