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

Toán Lớp 8: 6x(x-3)+x^2-9=0 Mong cac ban lam nhanh^^

Home/ Toán Lớp 8: 6x(x-3)+x^2-9=0 Mong cac ban lam nhanh^^

Toán Lớp 8: 6x(x-3)+x^2-9=0 Mong cac ban lam nhanh^^

Tháng Tư 15, 2022 Toán học 2 Comments 0 views

Toán Lớp 8: 6x(x-3)+x^2-9=0
Mong cac ban lam nhanh^^

Comments ( 2 )

  1. huenthanh97
    huenthanh97
    15 Tháng Tư, 2022 at 10:29 sáng
    Reply
    6x(x-3)+x^2-9=0
    <=>6x(x-3)+(x-3)(x+3)=0
    <=>(x-3)(6x+x+3)=0
    <=>(x-3)(7x+3)=0
    <=>\(\left[ \begin{array}{l}x-3=0\\7x+3=0\end{array} \right.\) 
    <=>\(\left[ \begin{array}{l}x=3\\x=-\dfrac{3}{7}\end{array} \right.\) 
    Vậy x=3 hoặc x=-3/7

  2. ngocbichchau
    ngocbichchau
    15 Tháng Tư, 2022 at 10:28 sáng
    Reply
    6x.(x-3)+x^2-9=0
    6x.(x-3)+(x+3)(x-3)=0
    (x-3)(6x+x+3)=0
    (x-3)(7x+3)=0
    TH1
    x-3=0
    x=3
    TH2
    7x+3=0
    7x=-3
    x=-3/7
    Vậy x∈{3; -3/7}

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

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