Tìm x: a) x + $\frac{1}{3}$x = -25% + 4x b) -4( $\frac{3}{2}$x + 2 ) - 9 = ( 3 - 2x )$\frac{1}{2}$ \ c) 2x - 6 > 0

2 câu trả lời

`a)x + 1/3 x = -25% + 4x`

`<=> 4/3 x -4x= -1/4`

`<=> -8/3 x = -1/4`

`<=> x=3/32`

`b) -4.(3/2 x + 2) - 9 = (3-2x).1/2`

`<=> -6x -8 -9 = 3/2 -x`

`<=> -6x + x = 3/2 + 17`

`<=> -5x = 37/2`

`<=> x = -37/10`

`c) 2x - 6>0`

`<=> 2x >6`

`<=> x >6/2`

`<=> x > 3`

 

` a) x + \frac{1}{3} x = - 25% + 4x `

` ⇒ x + \frac{ 1}{3} x - 4x = -1/4 `

` ⇒ (  1 + 1/3 -4 ) x = -1/4 `

` ⇒ -8/3 x = -1/4 `

` ⇒ x= \frac{3}{32} `

Vậy ` x= \frac{3}{32} `

` b) - 4 ( \frac{ 3}{2} x + 2 ) - 9 = ( 3 - 2x ) \frac{1}{2} `

` ⇒ -6x - 8 - 9 = 3/2  - x `

` ⇒ - 6x + x = 3/2 + 8 +9 `

` ⇒ -5x = \frac{37}{2} `

` ⇒ x = - \frac{37}{10} `

Vậy ` x = - \frac{37}{10} `

` c) 2x - 6 > 0 `

` ⇒ 2x > 6 `

` ⇒ x > 3 `

Vậy ` x > 3 `