g) 4(x – 5) – 3(x + 7) = -19 h) 7(x – 9) – 5(6 – x) = -6 + 11x i) 5(3 – 2x) + 5(x – 4) = 6 – 4x j) -3(x – 5) + 6(x + 2) = 9

0 bình luận về “g) 4(x – 5) – 3(x + 7) = -19 h) 7(x – 9) – 5(6 – x) = -6 + 11x i) 5(3 – 2x) + 5(x – 4) = 6 – 4x j) -3(x – 5) + 6(x + 2) = 9”

1. Đáp án:

    ở dưới

   Giải thích các bước giải:

   g) 4(x – 5) – 3(x + 7) = -19

   4x – 20 – 3x – 21= -19

   x = -19 + 20 + 21

   x = 22

   h) 7(x – 9) – 5(6 – x) = -6 + 11x

   7x – 63 – 30 + 5x = -6 + 11x

   7x + 5x – 11x = -6 + 63 + 30

   x = 87

   i) 5(3 – 2x) + 5(x – 4) = 6 – 4x

   15 – 10x + 5x – 20 = 6 – 4x

   -10x + 5x + 4x = 6 + 20 – 15

   x = 11

   j) -3(x – 5) + 6(x + 2) = 9

   -3x + 15 + 6x + 12 = 9

   -3x + 6x = 9 – 12 – 15

   3x = -18

   x = -18 : 3 

   x = -6

   Trả lời

2. Đáp án:

    

   Giải thích các bước giải:

   g) $4(x – 5) – 3(x + 7) = -19$

       $<=>4x-20-3x-21=-19$

       $<=>x=22$

   h)$ 7(x – 9) – 5(6 – x) = -6 + 11x$

      $7x – 63 – 30 + 5x = -6 + 11x$

      $x = 87$

   i) $5(3 – 2x) + 5(x – 4) = 6 – 4x$

      $15 – 10x + 5x – 20 + 4x= 6 $

      $-x = 11$

      $x = -11$

   j)$ -3(x – 5) + 6(x + 2) = 9$

     $-3x + 15 + 6x + 12 = 9$

     $3x = -18$

     $x = -18/3 $

     $x = -6$

   Trả lời