Câu 11: 

\(=\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{3}-\dfrac{1}{4}+\dfrac{1}{4}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{6}+\dfrac{1}{6}-\dfrac{1}{7}+\dfrac{1}{7}-\dfrac{1}{8}\)

\(=\dfrac{1}{2}-\dfrac{1}{8}=\dfrac{3}{8}\)

cảm ơn anh

a: Xét ΔABE và ΔHBE có 

BA=BH

\(\widehat{ABE}=\widehat{HBE}\)

BE chung

Do đó: ΔABE=ΔHBE

b: Ta có: ΔABE=ΔHBE

nên BA=BH và EA=EH

=>BE là đường trung trực của AH

d: ta có: EA=EH

mà EH<EC

nên EA<EC

a) Xét ΔABE và ΔHBE có:

 BA=BH

∠∠

BE :cạnh chung

Do đó: ΔABE=ΔHBE

b) Ta có: ΔABE=ΔHBE

nên BA=BH và EA=EH

=>BE là đường trung trực của AH

d) Ta có: EA=EH

mà EH<EC

nên EA<EC

Tại sao lại cao thế! =')

Mời các cao nhân giúp mình cái này :)

hỏi j nói luôn

????????????

A

Thx bro

=)?

Lag quá nên tự nhiên up vô, có câu hỏi r :)

Last weekend, I did something good for my family that made me feel very happy. On Saturday morning, I saw that my mother was very busy with housework. She had to cook, clean, and do the laundry. I decided to help her by cleaning the floor and washing the dishes. At first, I felt a little tired, but when I saw my mother smiling, I knew it was worth it. Later, my father praised me and said I was becoming more responsible. My younger brother also joined me, and together we finished the work quickly. That day, I learned that even small actions can bring joy to the people we love. Helping my family not only made them happy but also made me proud of myself. I will try to do more good deeds like this in the future.

Hi everyone, my name is Phuong Thao. I will introduce my family to you. Our family has 4 people including my father, my mother, my brother and me. My father is an engineer at a construction site near my home. My father is very busy. He usually had to stand outside all day. So he has a tanned skin. However, one day he still spends time playing with me. My mother is a good housewife. Every day I can eat delicious dishes that I cook. Mother takes care of her family very well. Before I go to bed, my mother usually reads me a story. My brother is 12 years old. I often play with him in my free time so my mom can do other things. I love my family very much.

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