x x 13 ___ – ____ = ___ 50 70 6

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1. $\frac{x}{50}$ – $\frac{x}{70}$ = $\frac{13}{6}$ (=) $\frac{7x-5x}{350}$ = $\frac{13}{6}$ (=) $\frac{2x}{350}$ = $\frac{13}{6}$ =) 12x = 4550 (=) x = $\frac{2275}{6}$

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2. $\dfrac{x}{50} – \dfrac{x}{70} = \dfrac{13}{6}$

   $⇔$ $\dfrac{2x}{350}= \dfrac{13}{6}$

   $⇔$ $\dfrac{2x}{350} = \dfrac{13}{6}$

   $⇒$ $2x.6=350.13$

   $⇔$ $12x = 4550$

   $⇔ x ≈ 379,16$

    Vậy $x ≈ 379,16$

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