[中學] help

[laiisnotlie ()]

1.(x+y+z)(x+y)(y+z)(z+x) is not equal to zero
2.x^2/(y+z)+y^2/(x+z)+z^2/(x+y)=0


find out:x^2/yz+y^2/xz+z^2/xy=?

thank you all

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推 GaussQQ     :-1
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