Question

 Giúp tớ bài 6 với ạ

Answer 1

\(\dfrac{a}{b+c}=\dfrac{b}{c+a}=\dfrac{c}{a+b}=\dfrac{a+b+c}{b+c+c+a+a+b}=\dfrac{1}{2}\)

\(\Rightarrow\dfrac{b+c}{a}=\dfrac{c+a}{b}=\dfrac{a+b}{c}=2\)

\(\Rightarrow A=2020-2+2-2=2018\)

Answer 2

write a paragraph (50 or more) about the reasons why students join different community activities