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uchiha_recca_2000@yahoo.com.vn


1.$ 5xy = 6(x+Y)$
$ 7yz = 12(y+z)$
$ 3zx = 4(x+z)$
2. $x- 1/y=1$
$y- 1/z = 1$
$z- 1/x = 1$
$ 7yz = 12(y+z)$
$ 3zx = 4(x+z)$
2. $x- 1/y=1$
$y- 1/z = 1$
$z- 1/x = 1$
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