Răspuns :
a+a+1+a+2=123
3a=123-3
a=120:3
a=40
40+1=41
40+2=42
nr sunt 40,41,42
b) y=41nr de mijloc
40+y+42=123
82+y=123=>y=123-82=>y=41
a) x=40 nr mic
x+41+42=123
x+83=123=>x=123-83=>x=40
c) z=42 nr mare
40+41+z=123
81+z=123=>z=123-81=>z=42
3a=123-3
a=120:3
a=40
40+1=41
40+2=42
nr sunt 40,41,42
b) y=41nr de mijloc
40+y+42=123
82+y=123=>y=123-82=>y=41
a) x=40 nr mic
x+41+42=123
x+83=123=>x=123-83=>x=40
c) z=42 nr mare
40+41+z=123
81+z=123=>z=123-81=>z=42
a+a+1+a+2=123
3a=123-3
a=120:3
40+1=41
40+2=42
40+y+42=123
x+83=123=x-123-83=40
40+42+7=123
81+z=123=z123-81=42
3a=123-3
a=120:3
40+1=41
40+2=42
40+y+42=123
x+83=123=x-123-83=40
40+42+7=123
81+z=123=z123-81=42