4/7 + X = 1/3 B,2/5+/2/3-X/=3/5

4/7 + X = 1/3 B,2/5+/2/3-X/=3/5

2 bình luận về “4/7 + X = 1/3 B,2/5+/2/3-X/=3/5”

  1. #wdr
    4/7+x=1/3
    x=1/3-4/7
    x= 7/21 -12/21
    x=-5/21
    B,
    2/5+|2/3 -x|=3/5
    |2/3-x|=3/5-2/5
    |2/3-x|=1/5
    => 2/3-x=1/5
    -x=1/5-2/3
    -x=3/15-10/15
    -x=-7/15 
    x=7/15
    => 2/3-x=-1/5
    -x=-1/5-2/3
    -x=-3/15-10/15
    -x=-13/15
    x=13/15
    Vậy x={7/15; 13/15}
     

    Trả lời
  2. 4/7+x=1/3
    => x=1/3-4/7
    => x=7/21-12/21
    => x=-5/21
    Vậy x=-5/21
    2/5+|2/3-x|=3/5
    => |2/3-x|=3/5-2/5
    => |2/3-x|=1/5
    TH1: 2/3-x=1/5
    => x=2/3-1/5
    => x=7/15
    TH2: 2/3-x=-1/5
    => x=2/3-(-1/5)
    => x=13/15
    Vậy x\in{7/15,13/15}

    Trả lời

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