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Tìm x, biết:

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( với x thuộc Z)

Theo dõi Vi phạm
YOMEDIA

Trả lời (1)

 
 
 
  • Bài 1: Dễ, tính máy tính là ra

    Bài 2:

    a) \(\dfrac{1}{5}+1\dfrac{1}{4}x=\dfrac{2}{3}\)

    \(\Rightarrow1\dfrac{1}{4}x=\dfrac{7}{15}\Rightarrow x=\dfrac{28}{75}\)

    Vậy \(x=\dfrac{28}{75}\)

    b) \(\left(\dfrac{2}{7}x-1\dfrac{1}{2}x\right):\dfrac{2}{7}=\dfrac{-21}{4}\)

    \(\Rightarrow\left(\dfrac{2}{7}x-\dfrac{3}{2}x\right):\dfrac{2}{7}=\dfrac{-21}{4}\)

    \(\Rightarrow\dfrac{2}{7}x-\dfrac{3}{2}x=\dfrac{-3}{2}\)

    \(\Rightarrow x\left(\dfrac{2}{7}-\dfrac{3}{2}\right)=\dfrac{-3}{2}\)

    \(\Rightarrow\dfrac{-17}{14}x=\dfrac{-3}{2}\Rightarrow x=\dfrac{21}{17}\)

    Vậy \(x=\dfrac{21}{17}\)

    c) \(\dfrac{5}{8}+\dfrac{1}{3}:x=\dfrac{1}{2}\)

    \(\Rightarrow\dfrac{1}{3}:x=\dfrac{-1}{8}\Rightarrow x=\dfrac{-8}{3}\)

    Vậy \(x=\dfrac{-8}{3}\)

    d) \(\dfrac{-5}{6}+\dfrac{8}{3}+\dfrac{-29}{6}< x< \dfrac{-1}{2}+2+\dfrac{5}{2}\)

    \(\Rightarrow-3< x< 4\)

    \(\Rightarrow x\in\left\{-2;-1;0;1;2;3\right\}\) vì x thuộc Z

    Vậy \(\Rightarrow x\in\left\{-2;-1;0;1;2;3\right\}\)

      bởi Phạm Khánh Linh 26/12/2018
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  • 1. Tính ( hợp lí nếu có thể )

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    b) \(\dfrac{17}{5}\left(5+\dfrac{2}{7}\right)+\dfrac{47}{7}\)x\(\dfrac{17}{5}\) e) \(2-1,6:\left(1+\dfrac{2}{3}\right)+4\%\)

    c)\(10\dfrac{3}{7}-\left(2\dfrac{1}{8}+4\dfrac{3}{7}\right)\)

    2. Tìm x, biết:

    a)\(\dfrac{2}{3}+x=-45\%\) 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    b)\(x+\dfrac{2}{3}x-\dfrac{4}{5}x=2\dfrac{1}{2}\) e)\(\dfrac{15}{x}-\dfrac{1}{3}=\dfrac{28}{51}\)

    c)\(45:\left(3x-4\right)=3^2\)

    3.Một khu cườn hình chữ nhật có chiều dài 60 m. Chiều rộng bằng \(\dfrac{3}{4}\) chiều dài

    a) Tính diện tích đám đất

    b) Người ta để \(\dfrac{7}{9}\) diện tích đám đất trồng cây ăn quả. 30% diện tích còn lại đào ao thả cá. Tính diện tích đào ao thả cá

    4. Trên nữa mặt phẳng bờ chứa tia Ox và hai tia Oy và Oz sao cho góc xOy=100o, xOz=20o.

    a)Tính góc yOz

    b)Vẽ Om là tia phân giác yOz. Tính xOm

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