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

Toán Lớp 7: (4x ² – 3 ) . (2x ² – 9 ) = 0 help ;-;

Toán Lớp 7: (4x ² – 3 ) . (2x ² – 9 ) = 0
help ;-;

Comments ( 2 )

  1. $ ( 4x² – 3 ) . ( 2x² – 9 ) = 0 $ 
    ⇒ \(\left[ \begin{array}{l}4x^2-3=0\\2x^2-9=0\end{array} \right.\) 
    ⇒ \(\left[ \begin{array}{l}4x^2=3\\2x^2=9\end{array} \right.\) 
    ⇒ \(\left[ \begin{array}{l}x^2=3/4\\x^2=9/2\end{array} \right.\) 
    ⇒ x không có giá trị nào thỏa mãn

  2. Lời giải chi tiết:
    (4x^2-3).(2x^2-9)=0
    =>\(\left[ \begin{array}{l}4x^2-3=0\\2x^2-9=0\end{array} \right.\)
    =>\(\left[ \begin{array}{l}4x^2=3\\2x^2=9\end{array} \right.\)
    =>\(\left[ \begin{array}{l}x^2=\dfrac{3}{4}\\x^2=\dfrac{9}{2}\end{array} \right.\)
    =>\(\left[ \begin{array}{l}x=±\sqrt{\dfrac{3}{4}}\\x=±\sqrt{\dfrac{9}{2}}\end{array} \right.\)
    Vậy x=±\sqrt{\frac{3}{4}} hoặc x=±\sqrt{\frac{9}{2}}

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

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