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

TRẢ LỜI

1. Giải đáp:

    $-15.(x+2)+7.(2x-3)=-50$

   $⇔ -15x-30+14x-21=-50$

   $⇔ -x-51=-50$

   $⇔ -x= (-50)+51$

   $⇔ -x= 1$

   $⇔x=-1$

   $vậy$ $x=-1$

    

   Trả lời
2.   $\text{– 15(x +2) + 7(2x – 3) = –50}$

   $\text{⇒-15x + ( -30) +14x – 21 = -50}$

   $\text{⇒ ( -15x +14x) +( -30 – 21) = -50}$

   $\text{⇒ -1x + ( -51) = -50}$

   $\text{⇒ -1x = 1}$

   $\text{⇒ x = -1}$ 

      $\text{Vậy x = -1}$

   Trả lời