4x-13=51 39-2(-7)=15 2(3x+1)-17=15 36:(13-3x)=9 2x+3(x-5)=10

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1. Đáp án:

    4x-13=51

   ⇔4x=51+13

   ⇔4x=64

   ⇔ x=64 : 4

   ⇔  x=16

   2(3x+1)-17=15

   ⇔2(3x+1)=15+17

   ⇔2(3x+1)=32

   ⇔3x+1=16

   ⇔ 3x=15

   ⇔ x=5

   36 : (13-3x)=9

   ⇔ 13-3x=36 : 9

   ⇔13-3x=4

   ⇔-3x=4-13

   ⇔-3x=-9

   ⇔  x=3

   2x+3(x-5)=10

   ⇔2x+3x-15=10

   ⇔5x=10+15

   ⇔5x=25

   ⇔  x=5

    

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2. Đáp án:

   `1)`

   `4x – 13 = 51`

   `=> 4x = 64`

   `=> x = 16`

   `2)`

   ` 39 – 2.(-7) = 15`

   ` =>` Xem lại đề

   `3)`

   `2(3x+1) – 17 = 15`

   ` => 2(3x+1) = 32`

   ` => 3x + 1  = 16`

   ` => 3x = 15`

   ` => x = 5`

   `4)`

   `36 :(13-3x) = 9`

   ` => 13 -3x = 4`

   ` => 3x = 9`

   ` => x = 3`

   ` 5)`

   ` 2x + 3(x-5) = 10`

   ` => 2x + 3x – 15 = 10`

   ` => 5x – 15 = 10`

   ` => 5x = 25`

   ` => x = 5` 

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