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

Toán Lớp 6: tìm x biết d) (2x-10) . (5 – x) = 0

Toán Lớp 6: tìm x biết
d) (2x-10) . (5 – x) = 0

Comments ( 2 )

  1. Lời giải chi tiết:
    (2x-10).(5-x)=0
    =>\(\left[ \begin{array}{l}2x-10=0\\5-x=0\end{array} \right.\)
    =>\(\left[ \begin{array}{l}2x=0+10\\x=5-0\end{array} \right.\)
    =>\(\left[ \begin{array}{l}2x=10\\x=5\end{array} \right.\)
    =>\(\left[ \begin{array}{l}x=10:2\\x=5\end{array} \right.\)
    =>\(\left[ \begin{array}{l}x=5\\x=5\end{array} \right.\)
    Vậy x=5

  2. Giải đáp:
    ta có :
    (2x-10) . (5 – x) = 0
    Trường  hợp 1 :
    2x  – 10 = 0
    => 2x  = 10
    => x  = 5
    trường  hợp  2 
    5 – x = 0
    => x  = 5
    vậy  để (2x-10) . (5 – x) = 0 thì  x  = 5
     
     

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