1/2 + 5/6 + 11/12 + 19/20 + 41/42 + 55/56 + 71/72 + 89/90 + 109/110

2 bình luận về “1/2 + 5/6 + 11/12 + 19/20 + 41/42 + 55/56 + 71/72 + 89/90 + 109/110”

1. 1/2 + 5/6 + 11/12 + 19/20 + 41/42 + 55/56 + 71/72 + 89/90 + 109/110

   =8-(1/2 + 1/6 + 1/12 + 1/20 + 1/42 + 1/56 + 1/72 + 1/90 + 1/110)

   =8-(1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+…+1/9-1/10+1/10-1/11)

   =8-1+1/11

   =9+1/11

   =9 1/11

   Trả lời
2. $\textit{Trả lời :}$ 

   Câu trả lời : 

   $\frac{1}{2}$ + $\frac{5}{6}$ + $\frac{11}{12}$ + $\frac{19}{20}$ + $\frac{41}{42}$ + $\frac{55}{56}$ + $\frac{71}{72}$ + $\frac{89}{90}$ + $\frac{109}{110}$

   = $8$ – $($ $\frac{1}{2}$ + $\frac{1}{6}$ + $\frac{1}{12}$ + $\frac{1}{20}$ + $\frac{1}{42}$ + $\frac{1}{56}$ + $\frac{1}{72}$ + $\frac{1}{90}$ + $\frac{1}{110}$ $)$

   = $8$ – $($ $1$ – $\frac{1}{2}$ + $\frac{1}{2}$ – $\frac{1}{3}$ + $\frac{1}{3}$ – $\frac{1}{4}$ +  $\frac{1}{4}$ – $\frac{1}{5}$ + $\frac{1}{5}$ – $\frac{1}{6}$ $+$ … $+$ $\frac{1}{9}$ – $\frac{1}{10}$ + $\frac{1}{10}$ – $\frac{1}{11}$ $)$

   = $8$ – $1$ + $\frac{1}{11}$ 

   = $7$ + $\frac{1}{11}$ 

   = $\frac{78}{11}$ 

   $#thomnguyen4116$ 

   Cho mình nhất nha 

   Chúc bạn học tốt ! 

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