A = 123 . 123
A = 15129.
B = 121 . 124
B = 15004.
=> 15129 >15004.
Vậy: A > B.
Ta có :
\(121.124=\left(123-2\right)\left(123+2\right)=123^2-2^2< 123^2\)
\(\Rightarrow A< B\)
ta có: A = 123 . 123
=> A= 121.123 + 123.2
B= 121.124
=> B = 121.123 + 121
ta thấy : 121.123 + 123.2 > 121.123+121
=> A > B
vậy A > B
A = 15129
B = 15004
Vì 16129 > 15004 nên A > B
Ta có:
\(A=123.123\)
\(\Rightarrow A=\left(121+2\right).123\)
\(\Rightarrow A=121.123+246\)
\(B=121.124\)
\(\Rightarrow B=121.\left(123+1\right)\)
\(\Rightarrow B=121.123+121\)
Vì \(121.123+246>121.123+121\) nên A > B
Vậy A > B
