2017 x 2018 +2019/2018 x 2019-2017 637 x 527-189/526 x 637 + 448 anh chị giúp em với ạ

0 bình luận về “2017 x 2018 +2019/2018 x 2019-2017 637 x 527-189/526 x 637 + 448 anh chị giúp em với ạ”

1. ` a) ` ` \frac{2017×2018+2019}{2018×2019-2017} `

   ` = \frac{2017×2018+(2018+1)}{2018×2019-(2018-1)} `

   ` = \frac{2017×2018+2018+1}{2018×2019-2018+1} `

   ` = \frac{2018×(2017+1)+1}{2018×(2019-1)+1} `

   ` = \frac{2018×2018+1}{2018×2018+1} `

   ` = 1 `

   ` b) ` ` \frac{637×527-189}{526×637+448} `

   ` = \frac{637×527-(637-448)}{526×637+448} `

   ` = \frac{637×527-637+448}{526×637+448} `

   ` = \frac{637×(527-1) + 448}{526×637+448} `

   ` = \frac{637×526+448}{526×637+448} `

   ` = 1 `

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2. $a$)

   Ta có:

   $\dfrac{2017 \times 2018 + 2019}{2018 \times 2019 – 2017}$

   $= \dfrac{2017 \times 2018 + 2019}{2018 \times 2017 + 2018 \times 2 – 2017}$

   $= \dfrac{2017 \times 2018 + 2019}{2018 \times 2017 + 4036 – 2017}$

   $= \dfrac{2017 \times 2018 + 2019}{2018 \times 2017 + 2019}$

   $= 1$

   $b$)

   Ta có:

   $\dfrac{637 \times 527 – 189}{526 \times 637 + 448}$

   $= \dfrac{637 \times 527 + 637 – 189}{526 \times 637 + 448}$

   $= \dfrac{637 \times 527 +448}{526 \times 637 + 448}$

   $= 1$

    

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