x-10=-90 2x-100=-60 |x-100|=1000 |x-1|+4=13

0 bình luận về “x-10=-90 2x-100=-60 |x-100|=1000 |x-1|+4=13”

1. `x-10=-90`

   `→x=-90+10`

   `→x=-80`

   Vậy `x=-80`

    `2x-100=-60`

   `→2x=-60+100`

   `→2x=40`

   `→x=20`

   Vậy `x=20`

   `|x-100|=1000`

   `→` \(\left[ \begin{array}{l}x-100=1000\\x-100=-1000\end{array} \right.\) 

   `→` \(\left[ \begin{array}{l}x=1100\\x=-900\end{array} \right.\) 

   Vậy `x∈{1100;-900}`

   `|x-1|+4=13`

   `→|x-1|=9`

   `→` \(\left[ \begin{array}{l}x-1=9\\x-1=-9\end{array} \right.\) 

   `→` \(\left[ \begin{array}{l}x=10\\x=-8\end{array} \right.\) 

    Vậy `x∈{10;-8}`

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2. Em tham khảo:

   a/

       $x-10=-90$

   ⇔$x=10+(-90)$ 

   ⇔$x=-80$

   b/

      $2x-100=-60$

   ⇔$2x=-60+100$

   ⇔$2x=40$

   ⇔$x=20$

   c/

       $|x-100|=1000$

   ⇔\(\left[ \begin{array}{l}x-100=1000\\x-100=-1000\end{array} \right.\) 

   ⇔\(\left[ \begin{array}{l}x=1100\\x=-900\end{array} \right.\) 

   d/

      $|x-1|+4=13$

   ⇔$|x-1|=9$

   ⇔\(\left[ \begin{array}{l}x-1=9\\x-1=-9\end{array} \right.\) 

   ⇔\(\left[ \begin{array}{l}x=10\\x=-8\end{array} \right.\) 

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