CHO TOG TRÊN LÀ A

\(A=\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{110.111}\)

\(=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{110}-\frac{1}{111}\)

\(=1-\frac{1}{111}\)

\(=\frac{110}{111}\)

teem xing dep

50 dm

name

what"s your name

thuy tinh

\(8^n:2^n=16^n\)

\(\left(2^3\right)^n:2^n=\left(2^4\right)^n\)

\(2^{3n}:2^n=2^{4n}\)

\(\Rightarrow3n-n=4n\)

\(\Rightarrow n\left(3-1\right)=4n\)

\(\Rightarrow n.2=4.n\)

\(\Rightarrow\)không có giá trị n

xu nu

hihi

chuan luon

xu nu

xu nu

xinh dep den dau co chu