XÉT 1 3( 2 )2021X X + X2020 D2020 DX X + X001 2020 D .A. 2021...
Câu 33. Xét
1
3
(
2
)
2021
x x + x2020 d0
1 2020 d .A.2021
( )
2021
2∫
u− u u2020
B.1
( )
2021
2∫
u− u u2∫
u−2020 u du. C.2021
( )
2021
D.1
( )
2021