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

Toán Lớp 8: tìm $x$ $(4x-5)^{2}$$=$$(x-3)^{2}$

Toán Lớp 8: tìm $x$
$(4x-5)^{2}$$=$$(x-3)^{2}$

Comments ( 2 )

  1. (4x-5)^2 = (x-3)^2
    <=> (4x-5)^2 – (x-3)^2 =0
    <=> (4x-5 – x+3)(4x-5 + x-3)=0
    <=> (3x – 2)(5x – 8)=0
    <=> \(\left[ \begin{array}{l}3x-2=0\\5x-8=0\end{array} \right.\) 
    <=> \(\left[ \begin{array}{l}3x=2\\5x=8\end{array} \right.\) 
    <=> \(\left[ \begin{array}{l}x=\dfrac{2}{3}\\x=\dfrac{8}{5}\end{array} \right.\) 
    Vậy x in { 2/3 ; 8/5} 
     

  2. Đáp án:
     
    Giải thích các bước giải:
     

    toan-lop-8-tim-4-5-2-3-2

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

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