Question

so sanh hai so bang cach van dung hang dang thuc

A=1999.2001va B=2000²

Answer 1

Ta có 1999*2001 = (2000-1)*(2000+1)
                               = 2000^2 - 1^2 
Biết 2000^2 = 2000^2
=> 2000^2 - 1^2 < 2000^2
<=> 1999*2001 < 2000^2