Tìm `x`: `x^10=48x^8` giúp vs lớp 7 nhaaaa;-;

Question

Tìm `x`:
`x^10=48x^8`
giúp vs lớp 7 nhaaaa;-;

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Tryphena 4 years 2020-10-13T08:41:20+00:00 2 Answers 119 views 0

Answers ( )

  1. Edana
    0
    2020-10-13T08:42:30+00:00
    Reply

    `x^10` = 49`x^8`

    Ta có 2TH

    TH1: x = 0

    => `0^10` = 49.`0^8`

    => 0 = 49 . 0

    => 0 = 0 (T/M)

    TH2: x khác 0

    => `x^10` = 48`x^8`

    => 49 = `x^10` : `x^8`

    => 49 = `x^2`

    => `7^2` = `x^2`

    => x = 7 hoặc -7 (T/M)

    XIN HAY NHẤT Ạ!

     

  2. minhkhang
    0
    2020-10-13T08:42:59+00:00
    Reply

    `x^10=49x^8`

    `=> x^2=49`

    `=> x=\in {-7;7;0}`

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