Tính: 1/2 + 5/6 + 11/12 + 19/20 + 29/30 + 29/30

Câu hỏi :

Tính: $\frac{1}{2}+\frac{5}{6}+\frac{11}{12}+\frac{19}{20}+\frac{29}{30}+\frac{41}{42}+\frac{55}{56}+\frac{71}{72}+\frac{89}{90}$