Question

1/ Tìm A biết rằng \(A=\frac{a}{b+c}=\frac{b}{a+c}=\frac{c}{a+b}\)

Answer 1

Ta có:A= a/b+c = b/a+c = c/a+b

=>A+1 = (a/b+c)+1 = (b/a+c)+1 = (c/a+b)+1

A+1= a+b+c/b+c = a+b+c/a+c = a+b+c/a+b

A+1= (a+b+c+a+b+c+a+b+c)/(b+c+a+c+a+b)

A+1= 3(a+b+c)/2(a+b+c)

A+1=3/2

=>A=(3/2)-1

A=1/2

Chắc thế

Answer 2

A=1/2.(Hình như thế)

Answer 3

kho the minh k bit lam

Answer 4

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

chon minh nha ban