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x-2017/2019 + x-2019/2017 = x+6/2021

H24
5 tháng 5 2018 lúc 19:02

\(\dfrac{x-2017}{2019}+\dfrac{x-2019}{2017}=\dfrac{x+6}{2021}\)

\(\Rightarrow\dfrac{x-2017}{2019}-1+\dfrac{x-2019}{2017}-1=\dfrac{x+6}{2021}-2\)

\(\Rightarrow\dfrac{x-2017}{2019}-\dfrac{2019}{2019}+\dfrac{x-2019}{2017}-\dfrac{2017}{2017}=\dfrac{x+6}{2021}-\dfrac{4042}{2021}\)

\(\Rightarrow\dfrac{x-2017-2019}{2019}+\dfrac{x-2019-2017}{2017}=\dfrac{x+6-4042}{2021}\)

\(\Rightarrow\dfrac{x-4036}{2019}+\dfrac{x-4036}{2017}=\dfrac{x-4036}{2021}\)

\(\Rightarrow\dfrac{x-4036}{2021}-\dfrac{x-4036}{2019}-\dfrac{x-4036}{2017}=0\)

\(\Rightarrow\left(x-4036\right)\left(\dfrac{1}{2021}-\dfrac{1}{2019}-\dfrac{1}{2017}\right)=0\)

=> x - 4036 = 0

=> x = 4036

Bình luận (1)
MC
8 tháng 5 2018 lúc 16:36

x − 2017/2019 + x−2019/2017 = x+6/2021

=> x − 2017/2019 + x−2019/2017 = x+6/2021

=> x − 2017/2019 − 1 + x − 2019/2017 − 1 = x + 6/2021 − 2

=> x − 2017/2019 − 1 + x − 2019/2017 − 1 = x + 6/2021 − 2

=> x − 2017/2019 − 2019/2019 + x − 2019/2017 − 2017/2017

= x + 6/2021 − 4042/2021

=> x − 2017/2019 − 2019/2019 + x − 2019/2017 2017/2017

= x + 6/2021 − 4042/2021

=> x − 2017 − 2019/ 2019 + x − 2019 − 2017/2017

= x + 6 − 4042/2021

=> x − 2017 − 2019/2019 + x − 2019 − 2017/2017 = x + 6 − 4042/2021

=> x − 4036/2019 + x − 4036/2017 = x − 4036/2021

=> x − 4036/2019 + x − 4036/2017 = x − 4036/2021

=> x − 4036/2021 − x − 4036/2019 − x − 4036/2017 = 0

=> x − 4036/2021 − x − 4036/2019 − x − 4036/2017 = 0

=>(x − 4036)(12021 − 12019 − 12017) = 0

=> x - 4036 = 0

=> x = 4036

Bình luận (0)

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