ta có 2015x2017=2015x(2016+1)=2015x2016+2015
2016x2016=(2015+1)x2016=2015x2016+2016
vì 2015<2016 nên 2015x2017<2016x2016
kick đúng cho mình nha
Ta có:
2015 × 2017
= 2015 × (2016 + 1)
= 2015 × 2016 + 2015
2016 × 2016
= (2015 + 1) × 2016
= 2015 × 2016 + 2016
Vì 2015 < 2016
=> 2015 × 2016 + 2015 < 2015 × 2016 + 2016
=> 2015 × 2017 < 2016 × 2016
2016.2016=(2015+1)(2017-1)=2015.2017-2015+2017-1=2015.2017+1\(>\)2015.2017
\(k\)mình nha
Ta có : 2015.2017=2015.(2016+1)
=2015.2016+2015
2016.2016=2016.(2015+1)
=2016.2015+2016
Vì : 2015.2016=2016.2015 và 2015 < 2016
<=>2015.2017<2016.2016