Rút gọn : A=3x-2|2x-5|

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Rút gọn : A=3x-2|2x-5|

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Tryphena 4 years 2020-10-13T16:33:45+00:00 2 Answers 98 views 0

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  1. minhkhang
    0
    2020-10-13T16:35:20+00:00
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    `A = 3x – 2 | 2x – 5 |`

    TH1: `2x – 5 ≥ 0` `⇔ x ≥ 5/2` `⇒2x – 5 = 2x – 5`

    `⇒A = 3x – 2(2x – 5)`

    `⇒A = 3x – 4x + 10`

    `⇒A = -x + 10 = 10 – x`

    TH2: `2x – 5 < 0` `⇔ x < 5/2` `⇒2x – 5 = -2x + 5`

    `⇒A = 3x – 2(-2x + 5)`

    `⇒A = 3x + 4x – 10`

    `⇒A = 7x – 10`

    Vậy [A=10−x (Nếu x ≥ 52)A=7x−10 (Nếu x < 52) 

  2. Edana
    0
    2020-10-13T16:35:22+00:00
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    Đáp án:

    A=3x–2|2x–5|+Khi:2x–5≥0⇒x≥52⇒|2x–5|=2x–5⇒A=3x–2(2x–5)=3x–4x+10=10–x+Khi:2x–5<0⇒x<52⇒|2x–5|=–2x+5⇒A=3x–2(–2x+5)=3x+4x–10=7x–10VayA=10–x(khi:x≥52)A=7x–10(khi:x<52)

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