Question

a=2009×2011

b=2010×2010

so sanh A và B

giup minh voi ai nhanh minh tich cho

không thuc hien phép tinh nha

Answer 1

Ta có: a= 2009 x 2010 = 2009 x (2010+1)=2009 x 2010 + 2009

            b= 2010 x 2010= 2010 x (2009+1)=2010 x 2009 + 2010

=> a < b (Vì 2009 x 2010 + 2009 < 2010 x 2009 + 2010)

Vậy a < b

     

Answer 2

a=2009.2011=4040099

b=2010.2010=4040100

Vi 4040099<4040100

nen a < b

Vay a < b .

Answer 3

a=2009(2010+1)=2009.2010+2009

b=2010.2010=2010(2009+1)=2010.2009+2010

vậy a<b

Answer 4

2009 * 2011 < 2010 * 2010