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\(\frac{2016}{2017}\)x \(\frac{2017}{2018}\)x \(\frac{2019}{2020}\)=\(\frac{504}{505}\)
đ/s:\(\frac{504}{505}\)
\(\frac{x+2019}{x+2018}=\frac{4038}{4037}\)
\(\Rightarrow\left(x+2019\right)4037=\left(x+2018\right)4038\)
\(\Rightarrow4037x+\left(4037\times2019\right)=4038x+\left(4038\times2018\right)\)
\(\Rightarrow4037x+8150703=4038x+8148684\)
\(\Rightarrow4037x-4038x=-8150703+8148684\)
\(\Rightarrow-x=-2019\)
\(\Rightarrow x=2019\)
P/s: Số to kinh -_- Ko chắc đúng đâu.
(x+2019) x 4037=(x+2018) x 4038
⇒4037�+(4037×2019)=4038�+(4038×2018)⇒4037x+(4037×2019)=4038x+(4038×2018)
⇒4037�+8150703=4038�+8148684⇒4037x+8150703=4038x+8148684
⇒4037�−4038�=−8150703+8148684⇒4037x−4038x=−8150703+8148684
⇒−�=−2019
⇒�=2019⇒x=2019
x+2019) x 4037=(x+2018) x 4038
⇒4037�+(4037×2019)=4038�+(4038×2018)⇒4037x+(4037×2019)=4038x+(4038×2018)
⇒4037�+8150703=4038�+8148684⇒4037x+8150703=4038x+8148684
⇒4037�−4038�=−8150703+8148684⇒4037x−4038x=−8150703+8148684
⇒−�=−2019
⇒�=2019⇒x=2019
1 tick với nha
\(\frac{x+2019}{x+2018}=\frac{4038}{4037}\)
\(\Leftrightarrow4037(x+2019)=4038(x+2018)\)
\(\Leftrightarrow4037x+8150703=4038x+8148684\)
\(\Leftrightarrow4037x+8150703-4038x=8148684\)
\(\Leftrightarrow4037x-4038x+8150703=8148684\)
\(\Leftrightarrow-x=-2019\)
\(\Leftrightarrow x=2019\)
\(\dfrac{2020}{2019}-\dfrac{2019}{2018}+\dfrac{1}{2019}x2018\)
\(=\dfrac{2020}{2019}-\dfrac{2019}{2018}+\dfrac{2018}{2019}=2-\dfrac{2019}{2018}=\dfrac{2017}{2018}\)
Trả lời :...............................................
\(\frac{4078379}{4078379}\)
Hk tốt,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
k nhé Kim Râu La
\(\frac{2016}{2017}\times\frac{2017}{2018}\times\frac{2018}{2019}\times\frac{2019}{2020}\)=
\(0,998109801980198\)
Đổi ra ta sẽ có !
\(\frac{504}{505}\)
Vậy là : ...................
S = 2020 + 2019 - 2018 - 2017 + 2016 + 2015 - 2014 - 2013 + ... + 4 + 3 - 2 - 1
= ( 2020 + 2019 - 2018 - 2017 ) + ( 2016 + 2015 - 2014 - 2013 ) + ... + ( 4 + 3 - 2 - 1 ) (có tất cả 2020 : 4 = 505 nhóm)
= 4 + 4 + ... + 4
= 4. 505 = 2020
Vậy S = 2020.