\(A=\frac{2}{2018\times2020}+\frac{2021}{2020}-\frac{2019}{2018}\)
\(A=\frac{2020-2018}{2018\times2020}+\frac{2021}{2020}-\frac{2019}{2018}\)
\(A=\frac{1}{2018}-\frac{1}{2020}+\frac{2021}{2020}-\frac{2019}{2018}\)
\(A=\left(\frac{2021}{2020}-\frac{1}{2020}\right)-\left(\frac{2019}{2018}-\frac{1}{2018}\right)\)
\(A=1-1=0\)
A= 2/2018*2020 + 2021/2020 - 2019/2018
giup em voi
So sánh 2018/2019 + 2019/2020 + 2020/2021:3
2021/2018 x 2022 ... ... ... 2019/2020 x 2020
Tính bằng cách thuận tiện :
( 2019 x 2020 + 1009 ) : ( 2020 x 2021 - 3031 )
Tính bằng cách thuận tiện:
A = 2017/2018 x 7/8 + 2017/2018 x 3/8 - 2017/2018 x 1/4
\(Sos\text{ánh}\frac{2018}{2019}+\frac{2019}{2020}+\frac{2020}{2021}v\text{ới}3\)
Cần gấp
2019+2021 - 1
2020 x 2019 + 2018
So sánh A và B, biết:
A= 2018 x 2020 + 2021
và B= 2019 x 2019 + 2021
Tính nhanh :
a,2017 x 2021 - 4031 / 2020 + 2017 x 2018
b,2017 x 2019 + 1009 / 2019 x 4035 - 1
