Toán 8 - Giải pt ẩn x

M

manh550

2.$\dfrac{x-a}{bc}+\dfrac{x-b}{ac}+\dfrac{x-c}{ab}=2(\dfrac{1}{a}+\dfrac{1}{b}+\dfrac{1}{c})$

<-> $\dfrac{ax-a^2+bx-b^2+cx-c^2}{abc}=2(\dfrac{ab+bc+ac}{abc})$

~> $(a+b+c)x - (a^2+b^2+c^2) = 2(ab+bc+ac)$

<-> $ (a+b+c)x = (a+b+c)^2$

~> $ x = a+b+c$
 
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