calculeaza folosind metoda factorului comun:

a)255+255•99-255•98=
255+255(99-98)=
255+255×1=
500
b)2015•2018+2015•2016-4034•2014=
2015(2018+2016)-4034•2014=
2015•4034-4034•2014=
4034(2015-2014)=
4034•1=
4034