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

Toán Lớp 7: c)4/9 + 2x= 3x + 1 d) 5x +2 > 3x + 1/3 e) x + 2/3 < 4x - 2

Toán Lớp 7: c)4/9 + 2x= 3x + 1
d) 5x +2 > 3x + 1/3
e) x + 2/3 < 4x - 2

Comments ( 2 )

  1. c) 4/9 + 2x = 3x + 1
    → 3x – 2x = 4/9 – 1
    ⇒  x = -5/9
    d) 5x + 2 > 3x + 1/3
        5x – 3x > 1/3 – 2
        2x > -5/3
        x > -5/3 : 2
    ⇒ x > -5/6
    e) x + 2/3 < 4x – 2
       x – 4x < -2 – 2/3
       -3x > -8/3
       x > -8/3 : -3
    ⇒ x > 8/9
     

  2. c,4/9+2x=3x+1
    ↔2x-3x=1-4/9
    ↔-x=5/9
    ↔x=-5/9
    Vậy x=-5/9
    d,5x+2>3x+1/3
    ↔5x-3x>1/3-2
    ↔2x> -5/3
    ↔x> -5/3:2
    ↔x> -5/6
    Vậy x> -5/6
    e,x+2/3<4x-2
    ↔x-4x<-2-2/3
    ↔-3x<-8/3
    ↔x> -8/3:(-3)
    ↔x> 8/9
    Vậy x>8/9

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

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