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

Toán Lớp 8: Giai pt sau: a.1+14/(x-4)^2=-9/x-4

Toán Lớp 8: Giai pt sau:
a.1+14/(x-4)^2=-9/x-4

Comments ( 2 )

  1. Giải đáp:
    1+\frac{14}{(x-4)^2}=-\frac{9}{x-4}(Đk: x\ne4)
    <=> 1+\frac{14}{(x-4)^2}+\frac{9}{x-4}=0
    <=> \frac{(x-4)^2+14+9(x-4)}{(x-4)^2}=0
    <=> \frac{(x-4)^2+14+9x-36}{(x-4)^2}=0
    <=> \frac{x^2-8x+16-22+9x}{(x-4)^2}=0
    <=> \frac{x^2+x-6}{(x-4)^2}=0
    <=> x^2+x-6=0
    <=> x^2+3x-2x-6=0
    <=> x(x+3)-2(x+3)=0
    <=> (x+3)(x-2)=0
    <=>\(\left[ \begin{array}{l}x+3=0\\x-2=0\end{array} \right.\) 
    <=>\(\left[ \begin{array}{l}x=-3\\x=2\end{array} \right.\) ™
    Vậy S={-3;2}

  2. Hic bài khó quá. Nếu sai cho mình xin lỗi nha
     

    toan-lop-8-giai-pt-sau-a-1-14-4-2-9-4

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

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