câu 13 nhé mn ~““DD

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câu 13 nhé mn ~““DD
cau-13-nhe-mn-dd

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Dâu 4 years 2020-10-17T09:42:13+00:00 2 Answers 94 views 0

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  1. Farah
    0
    2020-10-17T09:43:51+00:00
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    13 D

    14 C

     

  2. minhkhoi
    0
    2020-10-17T09:44:09+00:00
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    Câu 14: 

    `(9 – x^2)(x^2 – 3x + 2) = 0`

    `<=> (3 – x)(3 + x)(x^2 – 3x + 2) = 0`

    `<=>` \(\left[ \begin{array}{l}3 – x = 0\\3 + x = 0\\x^2 – 3x + 2 = 0 \end{array} \right.\) 

    `<=>` \(\left[ \begin{array}{l}x = 3\\x = -3\\x = 2\\x = 1\end{array} \right.\) 

    `=> B = {-3; 1; 2; 3}`

    cau-13-nhe-mn-dd

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