`c, 1/2 + 2x = 3x - 0,75`
`=> 3x - 2x = 1/2 + 0,75`
`=> x = 0,5 + 0,75`
`=> x = 1,25`
Vậy: `x = 1,25`
`d, (1 - 1/2x)^2 . (-1)/2 = (-1)/8`
`=> (1 - 1/2x)^2 = -1/8 : (-1/2)`
`=> (1 -1/2x)^2 = 1/4`
`=> (1 - 1/2x)^2 = (+-1/2)^2`
`=> [(1 - 1/2x = 1/2),(1 - 1/2x = -1/2):}`
`=> [(1/2x = 1/2),(1/2x = 3/2):}`
`=> [(x = 1),(x = 3):}`
Vậy: `x=1 ; x=3`
\(a,\dfrac{-1}{2}x+\dfrac{3}{4}=1\)
\(\dfrac{-1}{2}x=1-\dfrac{3}{4}\)
\(\dfrac{-1}{2}x=\dfrac{1}{4}\)
\(x=\dfrac{1}{4}:\dfrac{-1}{2}\)
\(x=\dfrac{1}{4}.\left(-2\right)\)
\(x=\dfrac{-1}{2}\)
Vậy .......
\(b,\dfrac{2}{3}+\dfrac{1}{3}:x=-1\dfrac{1}{3}\)
\(\dfrac{2}{3}+\dfrac{1}{3}:x=\dfrac{-4}{3}\)
\(\dfrac{1}{3}:x=\dfrac{-4}{3}-\dfrac{2}{3}\)
\(\dfrac{1}{3}:x=\dfrac{-6}{3}\)
\(\dfrac{1}{3}:x=-2\)
\(x=\dfrac{1}{3}:\left(-2\right)\)
\(x=\dfrac{-1}{6}\)
Vậy ...
`a, -1/2x + 3/4 = 1`
`=> -1/2x = 1 - 3/4`
`=> -1/2x = 1/4`
`=> x = 1/4 : (-1/2)`
`=> x = -1/2`
Vậy: `x=-1/2`
`b, 2/3 + 1/3 : x = -1 1/3`
`=> 2/3 + 1/3 : x = -4/3`
`=> 1/3 : x = -4/3 - 2/3`
`=> 1/3 : x = -2`
`=> x =1/3 : (-2)`
`=> x = -2/3`
Vậy: `x=-2/3`
