Giải chi tiết hết các bài 5 sao hay nhất

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Giải chi tiết hết các bài 5 sao hay nhất
giai-chi-tiet-het-cac-bai-5-sao-hay-nhat

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Sapo 4 years 2021-05-22T02:33:38+00:00 2 Answers 10 views 0

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  1. thienan
    0
    2021-05-22T02:35:23+00:00
    Reply

    Đáp án:

     

    Giải thích các bước giải:

     

    giai-chi-tiet-het-cac-bai-5-sao-hay-nhat

  2. kimcuc
    0
    2021-05-22T02:35:35+00:00
    Reply

    $\begin{array}{l}
    1)\dfrac{{ – 7}}{{18}} + \dfrac{{ – 5}}{6} + \dfrac{{ – 11}}{{12}} = \dfrac{{ – 14}}{{36}} + \dfrac{{ – 30}}{{36}} – \dfrac{{ – 33}}{{36}} = \dfrac{{ – 77}}{{36}}\\
    2)\dfrac{{ – 5}}{9} + \dfrac{5}{9}:\left( {1\dfrac{2}{3} – 2\dfrac{1}{{12}}} \right) =  – \dfrac{5}{9} + \dfrac{5}{9}:\left( {\dfrac{5}{3} – \dfrac{{25}}{{12}}} \right) = \dfrac{{ – 5}}{9} + \dfrac{5}{9}:\left( {\dfrac{{5.4 – 25}}{{12}}} \right) = \dfrac{{ – 5}}{9} + \dfrac{5}{9}:\dfrac{{ – 5}}{{12}} = \dfrac{{ – 17}}{9}\\
    3)\dfrac{{ – 7}}{{25}}.\dfrac{{11}}{{13}} + \dfrac{{ – 7}}{{25}}.\dfrac{2}{3}. – \dfrac{{18}}{{25}} = \dfrac{{ – 7}}{{25}}\left( {\dfrac{{11}}{{13}} – \dfrac{2}{3}} \right) – \dfrac{{18}}{{25}} = \dfrac{{ – 751}}{{975}}\\
    4)x + \dfrac{{ – 7}}{{15}} =  – 1\dfrac{1}{{20}} \Rightarrow x = \dfrac{{ – 21}}{{20}} – \dfrac{7}{{15}} = \dfrac{{ – 63 – 28}}{{60}} = \dfrac{{ – 91}}{{60}}\\
    5)\dfrac{{ – 2}}{3} + \dfrac{4}{5}x = \dfrac{1}{5} \Rightarrow \dfrac{4}{5}x = \dfrac{1}{5} + \dfrac{2}{3} = \dfrac{{13}}{{15}} \Rightarrow x = \dfrac{{13}}{{15}}:\dfrac{4}{5} = \dfrac{{13}}{{12}}\\
    6)2\left| x \right| – \dfrac{1}{2} = \dfrac{1}{4} \Rightarrow 2\left| x \right| = \dfrac{1}{4} + \dfrac{1}{2} = \dfrac{3}{4} \Rightarrow \left[ \begin{array}{l}
    x = \dfrac{3}{8}\\
    x = \dfrac{{ – 3}}{8}
    \end{array} \right.
    \end{array}$

     

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