GIÚP TỚ VỚI Ạ ????????????????????????????????????????????????????

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GIÚP TỚ VỚI Ạ ????????????????????????????????????????????????????
giup-to-voi-a

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Adela 1 year 2020-11-04T08:17:40+00:00 1 Answers 46 views 0

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    2020-11-04T08:19:12+00:00

    Đáp án:

    \(a.DK:x \ne \left\{ { – 2;1} \right\}\)

    Giải thích các bước giải:

    \(\begin{array}{l}
    a.DK:x \ne \left\{ { – 2;1} \right\}\\
    b.f\left( 0 \right) = \dfrac{{2.0 + 1}}{{0 + 2}} = \dfrac{1}{2}\\
    f\left( 0 \right) = \dfrac{{\sqrt[3]{{2.0 + 1}}}}{{0 – 1}} =  – 1\\
    f\left( 2 \right) = \dfrac{{2.2 + 1}}{{2 + 2}} = \dfrac{5}{4}\\
    f\left( 2 \right) = \dfrac{{\sqrt[3]{{2.2 + 1}}}}{{2 – 1}} = \sqrt[3]{5}\\
    f\left( { – 1} \right) = \dfrac{{2.\left( { – 1} \right) + 1}}{{ – 1 + 2}} =  – 1\\
    f\left( { – 1} \right) = \dfrac{{\sqrt[3]{{2.\left( { – 1} \right) + 1}}}}{{ – 1 – 1}} = \dfrac{1}{2}\\
    f\left( { – 3} \right) = \dfrac{{2.\left( { – 3} \right) + 1}}{{ – 3 + 2}} = 5\\
    f\left( { – 3} \right) = \dfrac{{\sqrt[3]{{2.\left( { – 3} \right) + 1}}}}{{ – 3 – 1}} = \dfrac{5}{4}
    \end{array}\)

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