O (c + a,(a+b) ifa+b+c= 0, then find the value of b+c) bcca ab

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( a+b+c=0 quad b+c=(-a) quad a+c=(-b) quad a+b=(-c) ) ( frac{(b+c)^{2}}{b c}+frac{(c+a)^{2}+b^{3}+c^{3}=3 a b c}{a}+frac{(a+b)^{2}}{a b} ) ( frac{a^{3}+b^{3}+c^{3}}{frac{a b^{2}}{b c}+frac{3 a b c}{a b c}}=3( ) fan ( frac{a b^{2} b^{2}}{a b^{2}}+frac{(-c)^{2}}{a b} )

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