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a) A = 2018.2018 - 2018.(2017+1) = 2018.2017 + 2018.
B = 2017.2019 = 2017.(2018+1) = 2017.2018 + 2017.
Vì 2018.2017 + 2018 > 2017.2018 + 2017 nên A > B.
b) A = 2019.2021 = (2018+1).2021 = 2018.2021 + 2021.
B = 2018.2022 = 2018.(2021+1) = 2018.2021+2018.
Vì 2018.2021+2021 >2018.2021+2018 nên A > B.
a) A = 2018.2018 - 2018.(2017+1) = 2018.2017 + 2018.
B = 2017.2019 = 2017.(2018+1) = 2017.2018 + 2017.
Vì 2018.2017 + 2018 > 2017.2018 + 2017 nên A > B.
b) A = 2019.2021 = (2018+1).2021 = 2018.2021 + 2021.
B = 2018.2022 = 2018.(2021+1) = 2018.2021+2018.
Vì 2018.2021+2021 >2018.2021+2018 nên A > B
Ta xét : \(B=\left(2017\right).2019=\left(2018-1\right)\left(2018+1\right)\)
\(B=2018.2018+2018-2018-1\)
\(B=2018.2018-1\)
Mà : \(A=2018.2018\)
\(Dođó:A>B\)
A=2018.(2017+1)=2017.2018+2018
B=2017.2019=2017.(2018+1)=2017.2018+2017
vì 2018>2017
=>A>B
A = 2019.2021 = (2018+1).2021 = 2018.2021 + 2021.
B = 2018.2022 = 2018.(2021+1) = 2018.2021+2018.
Vì 2018.2021+2021 >2018.2021+2018 nên A > B.
Bài1:
135 + x : 2 = 150
x : 2 = 150 - 135
x : 2 = 15
x = 15 x 2
x = 30
135 + x:2 =150
x:2 = 150 - 135
x:2 = 15
x = 15 x 2
x = 30