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

Toán Lớp 7: (1-3x)^2021=(3x-1)^2019 tìm x mn help bí oá

Tháng Hai 4, 2023 Toán học 2 Comments 0 views

Toán Lớp 7: (1-3x)^2021=(3x-1)^2019 tìm x
mn help bí oá

Comments ( 2 )

  1. minhtuquynh
    minhtuquynh
    4 Tháng Hai, 2023 at 8:00 sáng
    Reply

    Bạn tham khảo
    toan-lop-7-1-3-2021-3-1-2019-tim-mn-help-bi-oa

  2. tuanh
    tuanh
    4 Tháng Hai, 2023 at 8:00 sáng
    Reply
    (1-3x)^{2021} = (3x-1)^{2019}
    (3x-1)^{2019} – (1-3x)^{2021} = 0
    (3x-1)^{2019} + (3x-1)^{2021} = 0
    (3x-1)^{2019} [1 + (3x-1)^2] = 0
    ⇒ \(\left[ \begin{array}{l}(3x-1)^{2019}=0\\1+(3x-1)^{2}=0\end{array} \right.\)
    ⇒ \(\left[ \begin{array}{l}3x-1=0\\(3x-1)^2 = -1 (loại)\end{array} \right.\) 
    ⇒ 3x=1
    ⇒ x=1/3
                    Vậy x=1/3
     

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

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