forgetful

\(A=\dfrac{1}{xy+x+1}+\dfrac{1}{yz+y+1}+\dfrac{1}{xz+z+1}\)⇔\(A=\dfrac{z}{1+xz+z}+\dfrac{xz}{z+1+xz}+\dfrac{1}{xz+z+1}\)(vì xyz=1)

⇔\(A=\dfrac{z+xz+1}{xz+z+1}\)⇔\(A=1\)

Xong rồi nè bn ơi 

lx r

lx r

1. discussion

2. plentiful

3. entertainment

4. beautiful

5. suggestion

6. suitable

A. jumping

1. organization

2. youth

3. encouragement

4. information

5. arrival

6. performances

7. Advertising

8. hospitable

9. description

10. greeting - relatives

1. accommodation

2. pollution

3. harmful 

4. behaviour

5. participant