tim x: 4.(2x +3) ³ =1372

Question

tim x: 4.(2x +3) ³ =1372

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Nho 5 years 2021-05-21T14:29:08+00:00 2 Answers 35 views 0

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  1. Farah
    0
    2021-05-21T14:31:00+00:00
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    $#Dino$

    `4(2x+3)³=1372`

    `⇒(2x+3)³=1372:4=343`

    `⇔(2x+3)³=7^3`

    `⇔2x+3=7`

    `⇔2x=7-3`

    `⇔2x=4`

    `⇔x=2`

    Vậy `x=2`

  2. Orla
    0
    2021-05-21T14:31:01+00:00
    Reply

    Lời giải:

    `4 . (2x + 3)^3 = 1372`

    `⇒ (2x + 3)^3 = 1372 : 4`

    `⇒ (2x + 3)^3 = 343 = 7^3`

    `⇒ 2x + 3 = 7`

    `⇒ 2x = 7 – 3`

    `⇒ 2x = 4`

    `⇒ x = 4 : 2`

    `⇒ x = 2`

    Vậy `x = 2`.

     

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )