d)3x-(-36)=-27;e)|x+25|-12=27;f)|x-2|=8;g)2/x=-8/20

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1. `d ) 3x – ( – 36 ) = -27`

        `3x + 36 = -27`

        `3x = -27 – 36 = -63`

        `x = -63 : 3 = -21 `

   Vậy ` x = -21`

   `e ) | x + 25 | – 12 = 27`

       ` | x + 25 | = 39`

   `⇒` \(\left[ \begin{array}{l}x+25 = 39⇔ x = 14 \\x+ 25 = -39 ⇔ x = 64\end{array} \right.\) 

   `f ) | x – 2 | = 8`

   `⇒` \(\left[ \begin{array}{l}x-2=8⇔x = 10\\x-2 =-8 ⇔ x = -6\end{array} \right.\) 

   `g ) 2/x = -8/(20)`

   `⇒ -8 xx x = 2 xx 20`

   ` – 8x = 40`

   `x = 40 : ( – 8 ) = -5`

    

    

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2. $#Đáp án + Giải thích các bước giải:$

   `d)3x-(-36)=-27` 

   `→3x+36=-27`

   `→3x=-27-36`

   `→3x=-63`

   `→x=-63:3`

   `→x=-21`

   Vậy `x=-21`

   —————————–

   `e)|x+25|-12=27`

   `→|x+25|=27+12`

   `→|x+25|=39`

   `↔`\(\left[ \begin{array}{l}x+25=39\\x+25=-39\end{array} \right.\) 

   `↔`\(\left[ \begin{array}{l}x=39-25\\x=-39-25\end{array} \right.\) 

   `↔`\(\left[ \begin{array}{l}x=14\\x=-64\end{array} \right.\) 

   Vậy `x∈{14;-64}`

   ——————————-

   `f)|x-2| = 8`

   `→`\(\left[ \begin{array}{l}x-2=8\\x-3=-8\end{array} \right.\) 

   `→`\(\left[ \begin{array}{l}x=8+2\\x=-8+2\end{array} \right.\)

   `→`\(\left[ \begin{array}{l}x=10\\x=-6\end{array} \right.\) 

   Vậy `x∈{10;-6}`

   ——————————

   `g)2/x = -8/20`

   `→-8.x=2.20`

   `→-8.x=40`

   `→x=40:-8`

   `→x=-5`

   Vậy `x=-5`

   ——————————

   $#Cam$

   $#XIN HAY NHẤT CHO NHÓM AK$

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