A=2008.2008=2.1004.2.1004=4.1004^2
B=2006.2010=2.1003.2.1005=4.1005.1003
ta có:1004^2>1003.1005
A>B
b)4835+90=47.102+41+90=47.102+131
47.36+50<4835+90
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