A=$\frac{3}{2}$ - $\frac{5}{6}$ + $\frac{7}{12}$ - $\frac{9}{20}$ + $\frac{11}{30}$ - $\frac{13}{42}$ + $\frac{15}{56}$ - $\frac{17}{72}$ + $\frac{19}{90}$
Loga
Sinh Học lớp 12
