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

Toán Lớp 7: . Tìm x biết x : (1/12 – 3/4) = 1. A. x = –1/4 B. x = 2/3 C. x = –2/3 D. x = –3/2

Toán Lớp 7: . Tìm x biết x : (1/12 – 3/4) = 1.
A. x = –1/4 B. x = 2/3 C. x = –2/3 D. x = –3/2

Comments ( 2 )

  1. ** Giải đáp : C.
    ** Giải thích :
     x : ( 1/12 – 3/4 ) = 1
    ⇒ x : ( 1/12 – 9/12 ) = 1
    ⇒ x : ( – 2 )/3 = 1
    ⇒ x = 1 . ( – 2 )/3
    ⇒ x = – 2/3
    Vậy , x = – 2/3 .

  2. x : (1/12 -3/4) =1
    ⇒x : (1/12 – 9/12)=1
    ⇒x :(-8/12)=1
    ⇒x : (-2/3) =1
    ⇒x.(-3/2)=1
    ⇒x=1:(-3/2)
    ⇒x=1.(-2/3)
    ⇒x=-2/3
    Vậy x=-2/3
    -> Chọn C
     

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