Giúppppppp iemmmmm vớiiiiii

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Giúppppppp iemmmmm vớiiiiii
giuppppppp-iemmmmm-voiiiiii

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Sapo 5 years 2021-04-20T07:37:07+00:00 2 Answers 27 views 0

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  1. thienthanh
    0
    2021-04-20T07:38:35+00:00
    Reply

    Đáp án + Giải thích các bước giải:

    $\rm H=\dfrac{ \dfrac{3}{97}+\dfrac{3}{98}-\dfrac{3}{99} } { \dfrac{9}{97}+\dfrac{9}{98}-\dfrac{9}{99} } = \dfrac{ 3 . ( \dfrac{1}{97}+\dfrac{1}{98}-\dfrac{1}{99} )} { 9 . ( \dfrac{1}{97}+\dfrac{1}{98}-\dfrac{1}{99} )} = \dfrac{3}{9} = \dfrac{1}{3} \\ c) \ \dfrac{-2}{3} : \dfrac{5}{4} < \dfrac{x}{30} < \dfrac{5}{12} – \dfrac{22}{15} + \dfrac{7}{12} \\ \to \dfrac{-8}{15} < \dfrac{x}{30} < \dfrac{-7}{15} \\ \to \dfrac{-16}{30} < \dfrac{x}{30} < \dfrac{-14}{30} \\ \to -16 < x < -14 \\ Mà \ x \ \in \ Z \\ \to x=-15 \\ Vậy \ x=-15$

  2. Ladonna
    0
    2021-04-20T07:38:51+00:00
    Reply

    Đáp án:

     

    Giải thích các bước giải:

     ` (3/97 + 3/98 – 3/99)/(9/97+9/98+9/99)`

    ` = 3.(1/97+1/98-1/99)/9.(1/97+1/98-1/99)`

    ` = 1/3 `

    ` -2/3 : 5/4 < x/30<5/12-22/15+ 7/12 `

    `= -8/15 < x/30<-7/15 `

    ` = -16/30 < x/30 < -14/30 `

    ` = x \in{-15}`

    vậy ` x = -15 `

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