|X- 3 $\frac{1}{4}$ |=|5-X|

Question

|X- 3 $\frac{1}{4}$ |=|5-X|

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Verity 4 years 2020-10-24T10:20:42+00:00 2 Answers 63 views 0

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  1. Giakhanh
    0
    2020-10-24T10:22:08+00:00
    Reply

    `|x-3 1/4|=|5-x|`

    Xét `2` trường hợp sau:

    TH1:

    `x-3“1/4=5-x`

    `⇔x+x=5+3“1/4`

    `⇔2x=33/4`

    `⇔x=33/8`

    TH2:

    `x-3“1/4=x-5`

    `⇔x-x=-5+13/4`

    `⇔0x=-7/5`(vô lý)

    Vậy `x=33/8`

  2. dangkhoa
    0
    2020-10-24T10:22:23+00:00
    Reply

    Đáp án:

    `x=33/8`

    Giải thích các bước giải:

     `|x-3“1/4|=|5-x|`

    TH1:

    `x-3“1/4=5-x`

    `⇔x+x=5+3“1/4`

    `⇔2x=33/4`

    `⇔x=33/8`

    TH2:

    `x-3“1/4=x-5`

    `⇔x-x=-5+13/4`

    `⇔0x=-7/5`(vô lý)

    vậy `x=33/8`

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