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= ( 2020 + 2020 ) + ( 2020 + 2020 ) - ( 2020 x 4 )
= 4040 + 4040 - 8080
= 8080 - 8080
= 0
Quá rõ ràng là:
\(\frac{2020}{2010}>\frac{2020}{2019}\)rồi còn gì.
Trả lời
\(\frac{2020}{2010}=\frac{202}{201}=1+\frac{1}{201}\)
\(\frac{2020}{2019}=1+\frac{1}{2019}\)
Ta có:\(201< 2019\Rightarrow\frac{1}{201}>\frac{1}{2019}\)
\(\Leftrightarrow1+\frac{1}{201}>1+\frac{1}{2019}\)
\(\Leftrightarrow\frac{2020}{2010}>\frac{2020}{2019}\)
Vậy \(\frac{2020}{2010}>\frac{2020}{2019}\)
2019x25+2020x75-2020
=50 475+151 500-2020
=201 972-2020
=199 955
Tính nhanh
2020×28+74×2020-4040
= 2020 x 28 + 74 x 2020 - 2020 x 2
= 2020 x (28+74 - 2)
= 2020 x 100
= 202 000
\(a.=\dfrac{2019}{2020}\times\left(\dfrac{4}{11}+\dfrac{5}{11}+\dfrac{2}{11}\right)\\ =\dfrac{2019}{2020}\times1=\dfrac{2019}{2020}\\ b.=\dfrac{25}{27}\times\left(\dfrac{17}{14}-\dfrac{1}{14}-\dfrac{2}{14}\right)\\ =\dfrac{25}{27}\times1=\dfrac{25}{27}\)
A = 2019 x 2021
A = 2019 x (2020 + 1)
A = 2019 x 2020 + 2019
B = 2020 x (2019 + 1)
B = 2020 x 2019 + 2020
=> B > A
A = 2020 + 2020 + 2020 + ... + 2020
A = 2020 x 20
A = 40400
\(2020+2020+...+2020\) (\(20\) số \(2020\))
\(=2020\times20\)
\(=2020\times10\times2\)
\(=20200\times2\)
\(=40400\)