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a) A = 123.123 và B = 124.122
A = 123 .123 = 1232
B = 124 .122 = ( 123 + 1 ) . ( 123 -1 ) = 1232 - 1
Vì 1232 > 1232 - 1
=> A > b
b)A = 987.984 và B= 986.985
Câu b này cũng làm tương tự
Study well
a. A = 123 . 123
= (124 - 1)123
= 124.123 - 123
B = 124 . 122
= 124 . (123 - 1)
= 124 . 123 - 124
Vì 124.123 - 123 > 124.123 - 124 nên A > B
b. A = 987 . 984
= (986 + 1)984
= 986 . 984 + 984
B = 986 . 985
= 986 . (984 + 1)
= 986 . 984 + 986
Vì 986 . 984 + 984 < 986 . 984 + 986 nên A < B
![](https://rs.olm.vn/images/avt/0.png?1311)
a= 2002.2002=2002.(2000+2)=2002.2000+2002.2
b= 2000.2004=2000.(2002+2)=2002.2000+2000:2
vậy a>b.
*Sai xin lỗi nha*
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A) \(a=123.123\)
\(b=212.212\)
Vì \(123< 212\)=>\(123.123< 212.212\)
=> \(a< b\)
B)
\(a=2004.2004=2004.\left(2002+2\right)=2004.2002+2004.2\)
\(b=2002.2006=2002.\left(2004+2\right)=2002.2004+2002.2\)
VÌ \(2004.2>2002.2\)
=> \(2004.2002+2004.2>2004.2002+2002.2\)
=> \(a>b\)
A = 2004 x 2004
A = ( 2002 + 2 ) x 2004
A = 2002 x 2004 + 2 x 2004
B = 2002 x 2006
B = 2002 x ( 2004 + 2 )
B = 2002 x 2004 + 2 x 2004
Vì 2004 x 2 > 2002 x 2
=> 2002 x 2004 + 2004 x 2 > 2002 x 2004 + 2002 x 2
=> A > B
![](https://rs.olm.vn/images/avt/0.png?1311)
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.
![](https://rs.olm.vn/images/avt/0.png?1311)
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.
![](https://rs.olm.vn/images/avt/0.png?1311)
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.
![](https://rs.olm.vn/images/avt/0.png?1311)
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=123.123 = (120+3).123=120.123+3.123
B=120.124= 120.(123+1) = 120.123+120
so sánh 120.123 + 3.123 > 120.123 + 120