a ) 4x – 1 = 3x – 2 b ) x + 1 = 2 ( x – 3 ) c ) 2 ( x + 1 ) + 3 = 2 – x

0 bình luận về “a ) 4x – 1 = 3x – 2 b ) x + 1 = 2 ( x – 3 ) c ) 2 ( x + 1 ) + 3 = 2 – x”

1. a)4x−1=3x−2

   ⇔4x−3x=−2+1

   ⇔x=−1

   Vậyx=−1

   b)x+1=2(x−3)

   ⇔x+1=2x−6

   ⇔2x−x=1+6

   ⇔x=7

   Vậyx=7

   c)2(x+1)+3=2−x

   ⇔2x+2+3=2−x

   ⇔2x+x=2−3−2

   ⇔3x=−3⇔x=−1

   Vậyx=−1

    

   Bình luận

2. `a)4x-1=3x-2`

   `→4x-3x=-2+1`

   `→x=-1`

   Vậy `x=-1`

   `b)x+1=2(x-3)`

   `→x+1=2x-6`

   `→x-2x=-6-1`

   `→-x=-7`

   `→x=7`

   Vậy `x=7`

   `c)2(x+1)+3=2-x`

   `→2x+2+3=2-x`

   `→2x+x=2-5`

   `→3x=-3`

   `→x=-3:3`

   `→x=-1`

   Vậy `x=-1`

    

   Bình luận