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

Toán Lớp 7: Tìm x, biết a) x + 1/3 = 3/4 b) x – 2/5 = 5/7 c) -x – 2/3 = -6/7 d) 4/7 – x = 1/3

Toán Lớp 7: Tìm x, biết
a) x + 1/3 = 3/4
b) x – 2/5 = 5/7
c) -x – 2/3 = -6/7
d) 4/7 – x = 1/3

Comments ( 2 )

  1. a, x+1/3 = 3/4
    x= 3/4-1/3
    x=5/12
    Vậy x=5/12.
    b, x – 2/5 = 5/7
    x= 5/7+2/5
    x= 39/35
    Vậy x=39/35
    c, -x-2/3=-6/7
    -x=-6/7+2/3
    -x=-4/21
    Vậy x= 4/21
    d, 4/7-x=1/3
    x= 4/7-1/3
    x= 5/21
    Vậy x= 5/21.
    Chúc bạn học tốt!!!

  2. a) 
    x + 1/3 = 3/4
    x           = 3/4 – 1/3
    x           = 9/12 – 4/12
    x           = 5/12
    b)
    x – 2/5 = 5/7
    x          = 5/7 + 2/5
    x          = 25/35 + 14/35
    x          = 39/35
    c)
    -x – 2/3 = -6/7
    -x          = -6/7 + 2/3
    -x          = -18/21 + 14/21
    -x          = -4/21
    => x      = 4/21
    d)
    4/7 – x = 1/3
             x = 4/7 – 1/3
             x = 12/21 – 7/21
             x = 5/21
    #Huy

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

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