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ms.duyhieu
2 năm trước
Cho các số a,b,c,x,y,z ; trong đó a,b,c khác 0 và đôi một khác nhau thỏa mãn: $a(y+z)$ = $b(x+z)$ = $c(x+y)$. Chứng minh: $\frac{y-z}{a(b-c)}$ = $\frac{z-x}{b(c-a)}$ = $\frac{x-y}{c (a-b)}$
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