Question

tìm A=a/(b+c)=c/(a+b)=b/(c+a)

Answer 1

áp dụng tc dãy tỉ số bằng nhau ta có:

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

Answer 2

\(A=\frac{a}{b+c}=\frac{c}{a+b}=\frac{b}{c+a}=\frac{a+b+c}{2\left(a+b+c\right)}=\frac{1}{2}\)