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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 7: `a,` `|3x+1|=2` `b,` `|9-x|-1=7`

Toán Lớp 7: a, |3x+1|=2
b, |9-x|-1=7

Comments ( 2 )

  1. a, |3x+1| = 2
    ⇒ 3x + 1 = 2    hoặc 3x + 1 = -2
    +, 3x + 1 = 2
    ⇔  3x = 1
    ⇔ x = 1/3
    +, 3x + 1 = -2
    ⇔ 3x = -3
    ⇔ x = -1 
      ⇒ x = -1   hoặc   x = 1/3
    b,   |9-x| – 1 = 7
    ⇔ |9-x| = 8
    ⇔ 9 – x = 8    hoặc   9 – x = -8
    +, 9 – x = 8
    ⇔ -x = -1
    ⇔ x = 1
    +, 9 – x = -8
    ⇔ -x = -17
    ⇔ x = 17
      ⇒ x = 1   hoặc   x = 17
     

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222-9+11+12:2*14+14 = ? ( )

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