12 – 3x/32 = 6/4 – x

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12 – 3x/32 = 6/4 – x

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Verity 4 years 2020-10-14T18:29:57+00:00 2 Answers 111 views 0

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  1. Acacia
    0
    2020-10-14T18:30:58+00:00
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    Đáp án:

     `12 – (3x)/32 = 6/4 – x`

    `<=> 12 – 6/4 = (3x)/12 – x`

    `<=> 48/4 – 6/4 = (3x)/12 – (12x)/12`

    `<=> 42/4 =  (-9x)/12`

    `<=> 126/12 = (-9x)/12`

    `<=> 126 = -9x`

    `<=> x = 126 : (-9)`

    `<=> x = -14`

    Giải thích các bước giải:

     

  2. Philomena
    0
    2020-10-14T18:31:21+00:00
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    `12-{3x}/{32}=6/{4-x}`

    `{384-3x}/{32}=6/{4-x}`

    `(384-3x)(4-x)=32.6`

    `(384-3x)(4-x)=192`

    `⇒384-3x;4∈Ư(192)`

    Vì `384-3x⋮3⇒384-3x=±3`

    `TH1:384-3x=3⇒x=127`

                          `⇒4-x=64⇒x=-60`

    `TH2:384-3x=-3⇒x=129`

                          `⇒4-x=-64⇒x=68`

    Vậy $x∈\varnothing$

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