Question

2015 x 20 17 và  2016^2
hãy so sánh  

Answer 1

2015*(2016+1)=2015*2016+2015

2016^2=2016*(2015+1)=2015*2016+2016

=>2015*2017<2016^2

Answer 2

2015 x 2017 = 2015 x (2016 + 1) = 2015 x 2016 + 2015

2016^2 = 2016 x (2015 +1 )  =  2016 x 2015 + 2016 

Suy ra 

2015 x 2017 < 2016^2

Answer 3

thanks 2 bn nhìu