Tính:
a)20222022 x 2023 - 20232023 x 2022
Ai làm nhanh,chính xác và đẩy đủ mik tick cho nha.
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\(\dfrac{2021}{2022}\) x \(\dfrac{2022020222022}{202320232023}\) x \(\dfrac{20212021}{20232023}\)
= \(\dfrac{2021}{2022}\) x \(\dfrac{2022}{2023}\) x \(\dfrac{2021}{2023}\)
= \(\dfrac{2021\times2021}{2023\times2023}\)
= \(\dfrac{4084441}{4092529}\)
\(\dfrac{2022\times2023-1}{2023\times2021+2022}\)
= \(\dfrac{\left(2021+1\right)\times2023-1}{2023\times2021+2022}\)
= \(\dfrac{2023\times2021+2023-1}{2023\times2021+2022}\)
= \(\dfrac{2023\times2021+2022}{2023\times2021+2022}\)
= 1
2023×2021+20222022×2023−1
= (2021+1)×2023−12023×2021+20222023×2021+2022(2021+1)×2023−1
= 2023×2021+2023−12023×2021+20222023×2021+20222023×2021+2023−1
= 2023×2021+20222023×2021+20222023×2021+20222023×2021+2022
= 1
-2021 . 20222022 + 2022 .20212021
= -2021 . 2022. 10001 + 2022.2021. 10001
= 0
-2021 . 20222022 + 2022 . 20212021
= (-2021) . (20222022 - 2022 . 10001)
= (-2021) . (20222022 - 20222022)
= (-2021) . 0
= 0
\(V=\dfrac{1}{3}\pi r^2h=\dfrac{1}{3}\pi.2^2.3=4\pi\)
Chọn B
20222022 x 2023 - 20232023 x 2022
= 10001 x 2022 x 2023 - 10001 x 2023 x 2022
= 0
= 0