giải giúp mik cái nha. a)(5-x3)(x-4)=0

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giải giúp mik cái nha.
a)(5-x3)(x-4)=0

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Nem 5 years 2020-11-27T06:31:19+00:00 2 Answers 75 views 0

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  1. Acacia
    0
    2020-11-27T06:32:20+00:00
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    Đáp án:  `x ∈ { 5/3 ; 4 }`

    Giải thích các bước giải:

    `(5 – x . 3)(x – 4) = 0`

    `⇒` \(\left[ \begin{array}{l}5 – x . 3 = 0\\x – 4 = 0\end{array} \right.\) 

    `⇒` \(\left[ \begin{array}{l}x . 3 = 5\\x = 0 + 4 = 4\end{array} \right.\) 

    `⇒` \(\left[ \begin{array}{l}x = 5 : 3 = \frac{5}{3}\\x = 4\end{array} \right.\) 

    Vậy `x ∈ { 5/3 ; 4 }`

  2. giahuy
    0
    2020-11-27T06:32:21+00:00
    Reply

    `(5 – x . 3)(x – 4) = 0`

    `=> `\(\left[ \begin{array}{l}5 – x . 3 = 0\\x – 4 = 0\end{array} \right.\)

    `<=>`\(\left[ \begin{array}{l}x . 3 = 5\\x = 0 + 4\end{array} \right.\)

    `<=>`\(\left[ \begin{array}{l}x = $\frac{5}{3}$\\x = 4\end{array} \right.\)

    `=> x ∈ {5/3 ; 4}.`

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