Question

So sánh 

A=2002x2006                                      B=2003x2004

Answer 1

Ta có: A=2002x2006

=> A=2002x(2004+2)

=> A=2002x2004+2002x2

Ta có: B=2003x2004

=> B=(2002+1)x2004

=> B=2002x2004+2004

Vì 2002x2004=2002x2004 mà 2002x2>2004

=> A>B

Answer 2

A=4016012

B=4014012

So sánh A>B

hiệu A-B=2000

tổng A-B=8030024