đại 7 khó

D

dat2000

theo mình thì là :
a^2(b+c) = b^2(a+c)
\Rightarrow \frac{a+c}{b+c} = \frac{a^2}{b^2}
\Rightarrow \frac{1+c}{a} = \frac{1+c}{b}
\Leftrightarrow a=b
\Leftrightarrow a=b=c
\Rightarrow a^2(b+c) = b^2(a+c) = c^2(a+b) = 2013
\Rightarrow H = c^2(a+b) = 2013
;) ;) ;) ;) ;) ;) \\:D/ \\:D/ \\:D/ :cool: :cool: :cool: \\:D/
\\:d/
 
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