Tính nhanh:
-2021 . 20222022 + 2022 . 20212021
tính nhanh\(\dfrac{2021}{2022}x\dfrac{202220222022}{202320232023}x\dfrac{20212021}{20232023}\)
\(\dfrac{2021}{2022}\) x \(\dfrac{2022020222022}{202320232023}\) x \(\dfrac{20212021}{20232023}\)
= \(\dfrac{2021}{2022}\) x \(\dfrac{2022}{2023}\) x \(\dfrac{2021}{2023}\)
= \(\dfrac{2021\times2021}{2023\times2023}\)
= \(\dfrac{4084441}{4092529}\)
Câu 1. Kết quả của phép tính 20212022: 20212021 là:
A. 1.
B. 2021.
C. 2022.
D. 20212
cho phân số 20212021/20222022 . hãy rút gọn phân số .
\(\frac{20212021}{20222022}=\frac{20212021:10001}{20222022:10001}=\frac{2021}{2022}\)
Tính nhanh : 2022*2023-3 /2023*2021+2022
Cho x= 1+. Tính giá trị biểu thức
Q=
Tính nhanh: 2022. (2021-84)+1011. (-32-2. 2021)
Tính nhanh:
2022 x 2023 - 1/2023 x 2021 + 2022
\(\dfrac{2022\times2023-1}{2023\times2021+2022}\)
= \(\dfrac{\left(2021+1\right)\times2023-1}{2023\times2021+2022}\)
= \(\dfrac{2023\times2021+2023-1}{2023\times2021+2022}\)
= \(\dfrac{2023\times2021+2022}{2023\times2021+2022}\)
= 1
tính nhanh: ( 2022 x 0,75 + 2022 : 4) - ( 2021 : 0,1 : 10}
A = ( 2022 x 0,75 + 2022 : 4) - ( 2021 : 0,1 : 10)
= (2022 x 0,75 + 2022 x 0,25) - ( 2021 : 1/10 : 10)
= 2022 x(0,75+0,25) - 2021x 10 : 10
= 2022x 1 - 2021
= 2022 - 2021
=1
2021. 20212021