Đáp án:
`↓↓`
Giải thích các bước giải:
`a) 4x - 15 = -75 - x`
`=> 4x + x = -75 + 15`
`=> 5x = -60`
`=> x = ( -60 ) : 5`
`=> x = -12`
`b) | 2x - 7 | + 2 = 13`
`=> | 2x - 7 | = 13 - 2`
`=> | 2x - 7 | = 11`
`=>`\(\left[ \begin{array}{l}2x-7=11\\2x-7=-11\end{array} \right.\)
`=>` \(\left[ \begin{array}{l}x=9\\x=-2\end{array} \right.\)
`c) ( 2x - 1 ) ^2 = 9`
`=>` \(\left[ \begin{array}{l} ( 2x - 1 )^2 = 3^2 \\ ( 2x - 1 )^2 = (-3)^2\end{array} \right.\)
`=>` \(\left[ \begin{array}{l}2x-1=3\\2x-1=-3\end{array} \right.\)
`=>` \(\left[ \begin{array}{l}x=2\\x=-1\end{array} \right.\)
`d) 2x ( x - 3 ) = 0`
`=>` \(\left[ \begin{array}{l}2x=0\\x-3=0\end{array} \right.\)
`=>` \(\left[ \begin{array}{l}x=0\\x=3\end{array} \right.\)
