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A=2002.2002
A=(2000+2).2002
A=2000.2002+2002.2
B=2000.2004
B=2000.(2002+2)
B=2000.2002+2000.2
Vì 2000.2002=2000.2004; 2002.2>2000.2
=>2000.2002+2002.2> 2000.2004+2000.2
hay A>B
Vậy A>B
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a,\(45,47>44,58\)
b,\(67,71>65,63\)
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2017/2016 = 1 + 1/2016
2018/2017 = 1 + 1/2017
1/2016 > 1/2017
=> 2017/2016 > 2018/2017
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Ta có : a= 1234 . 2 . 11 + 2468 . 89
a = 2468 . 11 + 2468 . 89
a = 2468 . ( 11 + 89 )
a = 2468 . 100
b = 2468 . ( 121 - 21 )
b = 2468 . 100
=> a = b
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A = 34 . 55 - 71 = 33 . 54 + 34 + 54 - 71 = 33 . 54 + 17 = B
Vậy A = B
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A = 2002 . 2002
A = ( 2000 + 2 ) . 2002
A = 2000 . 2002 + 2 . 2002
B = 2000 . 2004
B = 2000 . ( 2002 + 2 )
B = 2000 . 2002 + 2000 . 2
Vì 2 . 2002 > 2000 . 2
=> A > B
Ta có : \(A=2002.2002=2002.\left(2000+2\right)=2002.2000+2002.2\)
\(B=2000.2004=2000.\left(2002+2\right)=2000.2002+2000.2\)
Ta thấy : \(2002.2000=2000.2002\)
\(2002.2>2000.2\)
\(\Rightarrow\) \(A>B\)