\(\frac{a+b-c}{c}=\frac{b+c-a}{a}=\frac{c+a-b}{b}\)
\(\frac{a+b-c}{c}+2=\frac{b+c-a}{a}+2=\frac{c+a-b}{b}+2\)
\(\frac{a+b+c}{c}=\frac{b+c+a}{a}=\frac{c+a+b}{b}\)
a =b= c
\(\frac{a+b+c}{c}=\frac{b+c+a}{a}=\frac{c+a+b}{b}\)
Tại sao a = b = c vậy Nguyễn Nhật Minh