Cho x,y,z thỏa mãn $\frac{2}{x+y}+\frac{2}{y+z}+\frac{2}{z+x}=\frac{1007z}{x+y}+\frac{1007x}{y+z}+\frac{1007y}{z+x}=2014$
Tính tổng $S=x+y+z$
Edited by nguyenanhshaff, 20-04-2016 - 19:27.
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