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

Toán Lớp 6: f/ – 15(x +2) + 7(2x – 3) = –50

Toán Lớp 6: f/ – 15(x +2) + 7(2x – 3) = –50

Comments ( 2 )

  1.   $\text{– 15(x +2) + 7(2x – 3) = –50}$
    $\text{⇒-15x + ( -30) +14x – 21 = -50}$
    $\text{⇒ ( -15x +14x) +( -30 – 21) = -50}$
    $\text{⇒ -1x + ( -51) = -50}$
    $\text{⇒ -1x = 1}$
    $\text{⇒ x = -1}$ 
       $\text{Vậy x = -1}$

  2. Giải đáp:
     $-15.(x+2)+7.(2x-3)=-50$
    $⇔ -15x-30+14x-21=-50$
    $⇔ -x-51=-50$
    $⇔ -x= (-50)+51$
    $⇔ -x= 1$
    $⇔x=-1$
    $vậy$ $x=-1$
     

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