2020/2019 x 2019/2018 x 2018/2017 x....................3/2
= 2020/2
= 1010
Đúng 2
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\(A=1\dfrac{1}{2019}\times1\dfrac{1}{2018}\times1\dfrac{1}{2017}\times...\times1\dfrac{1}{2}\)
\(=\dfrac{2020}{2019}\times\dfrac{2019}{2018}\times\dfrac{2018}{2017}\times...\times\dfrac{3}{2}\)
\(=\dfrac{2020}{2}\)
\(=1010\)
Đúng 3
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