B
boybi3tkhoc_9x


cho : $\dfrac{1}{a} + \dfrac{1}{b} + \dfrac{1}{c} =0$
tính :
$\dfrac{bc}{a^2}+\dfrac{ac}{b^2}+\dfrac{ab}{c^2}$
tính :
$\dfrac{bc}{a^2}+\dfrac{ac}{b^2}+\dfrac{ab}{c^2}$
Last edited by a moderator: