1. |-8| – |2x -1| = -1 2. (-3x + 12 ) . ( x+1 ) =0 = > Giúp mình ạ ! 20/09/2021 Bởi Alice 1. |-8| – |2x -1| = -1 2. (-3x + 12 ) . ( x+1 ) =0 = > Giúp mình ạ !
Đáp án: ↓↓↓ Giải thích các bước giải: `1, |-8|-|2x-1|=-1` ⇒`8-|2x-1|=-1` ⇒`|2x-1|=9` ⇒`x=5` hoặc `x=-4` `2,(-3x+12)(x+1)=0` ⇒\(\left[ \begin{array}{l}-3x+12=0\\(x+1)=0\end{array} \right.\) ⇒\(\left[ \begin{array}{l}x=4\\x=-1\end{array} \right.\) Bình luận
1) `|-8| – |2x -1| = -1 ` `=>8-|2x -1| = -1 ` `=>|2x -1| =8-(-1)` `=>|2x -1| =9` `=>`\(\left[ \begin{array}{l}2x -1 =9\\2x -1 =-9\end{array} \right.\) `=>`\(\left[ \begin{array}{l}2x=10\\2x=-8\end{array} \right.\) `=>`\(\left[ \begin{array}{l}x=5\\x=-4\end{array} \right.\) 2) `(-3x + 12 ) . ( x+1 ) =0` `=>`\(\left[ \begin{array}{l}-3x + 12=0\\x+1=0\end{array} \right.\) `=>`\(\left[ \begin{array}{l}-3x=-12\\x=-1\end{array} \right.\) `=>`\(\left[ \begin{array}{l}x=4\\x=-1\end{array} \right.\) Bình luận
Đáp án:
↓↓↓
Giải thích các bước giải:
`1, |-8|-|2x-1|=-1`
⇒`8-|2x-1|=-1`
⇒`|2x-1|=9`
⇒`x=5` hoặc `x=-4`
`2,(-3x+12)(x+1)=0`
⇒\(\left[ \begin{array}{l}-3x+12=0\\(x+1)=0\end{array} \right.\)
⇒\(\left[ \begin{array}{l}x=4\\x=-1\end{array} \right.\)
1)
`|-8| – |2x -1| = -1 `
`=>8-|2x -1| = -1 `
`=>|2x -1| =8-(-1)`
`=>|2x -1| =9`
`=>`\(\left[ \begin{array}{l}2x -1 =9\\2x -1 =-9\end{array} \right.\)
`=>`\(\left[ \begin{array}{l}2x=10\\2x=-8\end{array} \right.\)
`=>`\(\left[ \begin{array}{l}x=5\\x=-4\end{array} \right.\)
2)
`(-3x + 12 ) . ( x+1 ) =0`
`=>`\(\left[ \begin{array}{l}-3x + 12=0\\x+1=0\end{array} \right.\)
`=>`\(\left[ \begin{array}{l}-3x=-12\\x=-1\end{array} \right.\)
`=>`\(\left[ \begin{array}{l}x=4\\x=-1\end{array} \right.\)