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

Toán Lớp 6: B3 : Tìm x , biết a. ( 3/5 – x ) + 13/20 = 5/6 b. 3/4 + 1/4 ÷ x = -3

Toán Lớp 6: B3 : Tìm x , biết
a. ( 3/5 – x ) + 13/20 = 5/6
b. 3/4 + 1/4 ÷ x = -3

Comments ( 2 )

  1. Bài 3:
    a) (3/5 – x) + 13/20 = 5/6
    => 3/5 – x= 5/6 – 13/20
    => 3/5 – x= 11/60
    => x= 3/5 -11/60
    => x=5/12
    Vậy x= 5/12
    b) 3/4  + 1/4 : x = -3
    => 1/4 : x = -3 – 3/4
    => 1/4 : x=-15/4
    => x= 1/4:(-15)/4
    = x = 1/4 . (-4/15)
    => x=-1/15
    Vậy x= -1/15
     

  2. a) ( 3/5 – x ) + 13/20 = 5/6
    ( 3/5 – x) = 5/6 – 13/20
    3/5 – x = 11/60
    x = 3/5 – 11/60
    x = 5/12
    Vậy  x = 5/12
    3/4 + 1/4 : x = -3
    1/4 : x = -3 – 3/4
    1/4 : x = -15/4
    x = 1/4 : (-15/4)
    x = -1/15
    Vậy x = -1/15
     

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

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