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 `
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