1/x-1/y-1/z=1
=>1/x^2+1/y^2+1/z^2-2/xy-2/xz+1/yz=1
=>\(\dfrac{1}{x^2}+\dfrac{1}{y^2}+\dfrac{1}{z^2}=1\)
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1/x-1/y-1/z=1
=>1/x^2+1/y^2+1/z^2-2/xy-2/xz+1/yz=1
=>\(\dfrac{1}{x^2}+\dfrac{1}{y^2}+\dfrac{1}{z^2}=1\)