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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 7: $\dfrac{-2}{5}$ `+` $\dfrac{5}{6}$ `x` `=` $\dfrac{-4}{15}$

Toán Lớp 7: $\dfrac{-2}{5}$ + $\dfrac{5}{6}$ x = $\dfrac{-4}{15}$

Comments ( 2 )

  1. -2/5 + 5/6x = -4/15
    => 5/6x = -4/15 + 2/5 = 2/15
    => x = 2/15 : 5/6 = 12/75 = 4/25
     

  2. $\frac{-2}{5}$ + $\frac{5}{6}$x = $\frac{-4}{15}$ 
    $\frac{5}{6}$x = $\frac{-4}{15}$ – $\frac{-2}{5}$
    $\frac{5}{6}$x = $\frac{-4}{15}$ + $\frac{2}{5}$
    $\frac{5}{6}$x =          $\frac{2}{15}$
                       x  =        $\frac{2}{15}$ : $\frac{5}{6}$
                        x =         $\frac{2}{15}$ x $\frac{6}{5}$ 
                         x =            $\frac{12}{75}$ 
                         x =            $\frac{4}{25}$ 
    Lunangoctrang1

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222-9+11+12:2*14+14 = ? ( )