Răspuns :
a+a+2+a+4+a+6=72
4a+12=72
4a=72-12
4a=60
a=15
a+2=15+2=17
a+4=15+4=19
a+6=15+6=21
Deci numerele sunt : 15 , 17 , 19 , 21
4a+12=72
4a=72-12
4a=60
a=15
a+2=15+2=17
a+4=15+4=19
a+6=15+6=21
Deci numerele sunt : 15 , 17 , 19 , 21
a +b +c +d =72
a ____/
b ____/ +2
c ____/ +2 +2
d ____/ +2 +2 +2
2 * 6 =12
72 -12 =60
60 / 4 =15
a =15
b =15 +2 =17
c =17 +2 =19
d =19 +2 =21
proba: 15 +17 +19+ 21 =72
a ____/
b ____/ +2
c ____/ +2 +2
d ____/ +2 +2 +2
2 * 6 =12
72 -12 =60
60 / 4 =15
a =15
b =15 +2 =17
c =17 +2 =19
d =19 +2 =21
proba: 15 +17 +19+ 21 =72