Răspunsuri

2014-06-01T11:41:37+03:00
A+a+1+a+2= -12

3a +3=-12

3a= -12-3

3a=- 15

a=-5

a+1=-5+1= -4

a+2= -5+2= -3
2014-06-01T11:54:39+03:00
Notam cu:
a=primul nr
a+1=al doilea nr
a+2 =al treilea nr
(adaunam mereu 1 pentru ca sunt consecutive)
a+a+1+a+2=-12
3a+3=-12
3a=-12-3
3a=-15
a=-15:3
a=-5(primul nr=
-5+1=-4(al doilea nr)
-5+2=-3(al treilea nr)