Răspuns:
Vom rezolva aceste exerciții prin scoaterea factorului comun
a)
2012 + 2012 × 2013 - 2013 × 2014 =
2012 × ( 1 + 2013) - 2013 × 2014 =
2012 × 2014 - 2013 × 2014 =
2014 × (2012 - 2013) =
2014 × ( - 1) =
- 2014
b)
2013² - 2012 × 2013 - 2013 =
2013 × (2013 - 2012 - 1) =
2013 × 0 =
0
