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khaiproqn81

$\frac{x^2(y-z)+y^2(z-x)+z^2(x-y)}{x^2y-x^2z+y^2z-y^3}$
$\frac{x^2y-x^2z+y^2z-xy^2+xz^2-yz^2}{x^2y-x^2z+y^2z-y^3}$
$\frac{y(x^2-z^2)-y^2(x-z)-xz(x-z)}{x^2(y-z)-y^2(y-z)}$
$\frac{(x-z)(xy+yz-y^2-xz)}{(y-z)(x^2-y^2)}$
$\frac{(x-z)[y(x-y)-x(x-y)]}{(x-y)(x+y)(y-z)}$
$\frac{(x-y)(y-z)(x-z)}{(x-y)(x+y)(y-z)}$
$\frac{x-z}{x+y}$
 
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