2(x-5)-17=25 24+3(.5-x)=27 15+42:x=17 Giúp minh đi

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1. `2 (x-5) -17 = 25`

   ` => 2x -10 – 17 = 25`

   ` => 2x – 27 = 25`

   ` => 2x = 52`

   ` => x=  52 : 2 = 26`

   Vậy ` x = 26`

   **********

   ` 24 + 3(5 – x) = 27`

   ` => 3(5-x) = 27 – 24= 3`

   ` => 5 – x = 1`

   ` => x = 5- 1 = 4`

   Vậy ` x= 6`

   **********

   ` 15 +42 : x = 17`

   ` => 42 : x = 15 – 17 = -2`

   ` => x=  42: (-2) `

   ` => x= -21`

   Vậy ` x = -21`

    

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2. `a,2(x-5)-17=25`

   `⇔2(x-5)=42`

   `⇔x-5=21`

   `⇔x=26`

   $\text{Vậy x=26}$

   `b,24+3(5-x)=27`

   `⇔3(5-x)=3`

   `⇔5-x=1`

   `⇔x=4`

   $\text{Vậy x=4}$

   `c,15+42:x=17`

   `⇔42:x=2`

   `⇔x=21`

   $\text{Vậy x=21}$

    

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