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

Toán Lớp 6: a) 2/3 + ( x – 1/2 ) = 7/5 b) ( 1/3 + x ) . 7/8 = 2/9 c) 2/11 : ( 3x + 1/2 )

Toán Lớp 6: a) 2/3 + ( x – 1/2 ) = 7/5
b) ( 1/3 + x ) . 7/8 = 2/9
c) 2/11 : ( 3x + 1/2 )

Comments ( 2 )

  1. Lời giải và giải thích chi tiết:
    a)
    2/3 + (x – 1/2) = 7/5
    -> x – 1/2 = 7/5 – 2/3 = 11/15
    -> x = 11/15 + 1/2
    -> x = 37/30
    Vậy  x = 37/30
    b)
    (1/3 + x) . 7/8 = 2/9
    -> 1/3 + x = 2/9 : 7/8 = 16/63
    -> x = 16/63 – 1/3
    -> x = -5/63
    Vậy  x = -5/63
    c)
    2/11 : (3x + 1/2) = 2/7
    -> 3x + 1/2 = 2/11 : 2/7 = 7/11
    -> 3x = 7/11 – 1/2 = 3/22
    -> x = 3/22 : 3 = 1/22
    Vậy  x = 1/22
    text(#Kakaseto)

  2. Lời giải và giải thích chi tiết:
    a, 2/3 + ( x – 1/2 ) = 7/5
    => x – 1/2 = 21/15 – 10/15
    => x – 1/2 = 11/15
    => x = 22/30 + 15/30
    => x=37/30
             Vậy x=37/30
    b, (1/3 + x) . 7/8 = 2/9
    => 1/3+x=2/9 : 7/8
    => 1/3 + x=16/63
    => x=16/63 – 21/63
    => x=-5/63
           Vậy x=-5/63
    c, 2/11 : (3x+1/2) = 2/7
    => 3x+1/2 = 2/11 : 2/7
    => 3x+1/2 = 7/11
    => 3x=14/22 – 11/22
    => 3x=3/22
    => x=3/22 : 3
    => x=1/22
              Vậy x=1/22 

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

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