a+b+c=0, \text { then }\left(\frac{a^{2}}{b c}+\frac{b^{2}}{c a}+\frac – InterviewSolution

1.	a+b+c=0, \text { then }\left(\frac{a^{2}}{b c}+\frac{b^{2}}{c a}+\frac{c^{2}}{a b}\right)=?
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