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

Toán Lớp 7: 3x – 1/2 = -3/0,4 giup minh voi

Toán Lớp 7: 3x – 1/2 = -3/0,4 giup minh voi

Comments ( 2 )

  1. 3x – 1/2 = -3/{0,4}
    3x – 1/2 = -15/2
    3x = -15/2 + 1/2
    3x = -14/2 = -7
    x = (-7) : 3
    x = -7/3

  2. 1.
    3x – 1/2 = -3/(0,4)
    ⇔3x- 1/2 = -15/2
    ⇔3x = -15/2 + 1/2
    ⇔3x=-7
    ⇔x=-7/3
     

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