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

Toán Lớp 7: ( 3 ???? − 2 ) ( ????² + 2 ) = 0 mik cần gấp

Toán Lớp 7: ( 3 ???? − 2 ) ( ????² + 2 ) = 0
mik cần gấp

Comments ( 2 )

  1. Answer
    (3x – 2) . (x^2 + 2) = 0
    => $\left[\begin{matrix} 3x – 2 = 0\\ x^2 + 2 = 0\end{matrix}\right.$
    => $\left[\begin{matrix} 3x = 0 + 2\\ x^2 = 0 – 2\end{matrix}\right.$
    => $\left[\begin{matrix} 3x = 2\\ x^2 = – 2 \ \text{(KTM)}\end{matrix}\right.$
    => $\left[\begin{matrix} x = 2 : 3\\ x^2 = – 2\ \text{(KTM)}\end{matrix}\right.$
    => $\left[\begin{matrix} x = \dfrac{2}{3} \ \text{(TM)}\\ x^2 = – 2\ \text{(KTM)}\end{matrix}\right.$
    $\text{Vậy}$ x = 2/3

  2. Giải đáp:
    ( 3 ???? − 2 ) ( ????² + 2 ) = 0
    <=> 3x-2=0
    hoặc ????²+2=0
    <=> 3x=2
    hoặc ????²=-2(vô nghiệm)
    <=>x=3/2
    Vậy S=(3/2)
     

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