Đáp án:
Bài `1`
` 1)`
` (2x -5) + 17 = 6 `
` 2x -5 +17= 6`
` 2x +12 = 6`
` 2x= -6`
` x =-3`
`2)`
` 10 - 2(4-3x) = -4`
` 10 - 8 + 6x + 4 = 0`
` 6x + 6 = 0`
` 6x = -6`
` x= -1`
`3)`
` -12 + 3(-x+7) = -18`
` 3(-x+7) = -6`
` - x +7 = -2`
` -x = -9`
`
` x = 9`
`4)`
` 24 : (3x-2) = -3`
` 3x -2 = -8`
` 3x = -6`
` x = -2`
`5)`
` -45 : 5(-3 -2x) = 3`
` 5(-3x-2) = -15`
` -3x -2 = -3`
` -3x = -1`
` x = 1/3`
Bài `2`
` 1)`
` => ` \(\left[ \begin{array}{l}x=0\\x+7=0\end{array} \right.\)
`=>` \(\left[ \begin{array}{l}x=0\\x=-7\end{array} \right.\)
`2)`
` => ` \(\left[ \begin{array}{l}x+12=0\\x-3=0\end{array} \right.\)
` =>` \(\left[ \begin{array}{l}x=-12\\x=3\end{array} \right.\)
`3)`
` => ` \(\left[ \begin{array}{l}-x+5=0\\3-x=0\end{array} \right.\)
` =>` \(\left[ \begin{array}{l}x=5\\x=3\end{array} \right.\)
`4)`
` => x = 0`
hoặc ` 2 + x = 0` hoặc ` 7 - x = 0`
` => x = 0` hoặc ` x = -2 ; x =7`
`5)`
` => x -1 = 0` hoặc ` x +2 = 0` hoặc ` -x-3 = 0`
` => x =1` ; ` x = -2 ; x = 3`
