Răspuns :
a+b=77 a=77-b
a+c=124 77-b+c=124
b+c=77
============
77-b+c+b+c=124+77
77+2c=201
2c=201-77
2c=124
c=62
a+c=124
a+62=124
a=124-62
a=62
a+b=77
62+b=77
b=77-62
b=15
b)a+b=55 a=55-b
a+c=124 55-b+c=124
b+c=77
------------------------------------------------------
55-b+c+b+c=124+77
55+2c=201
2c=201-55
2c=146
c=146:2
c=73
a+c=124
a+73=124
a=124-73
a=51
b+c=77
b+73=77
b=77-73
b=4
a+c=124 77-b+c=124
b+c=77
============
77-b+c+b+c=124+77
77+2c=201
2c=201-77
2c=124
c=62
a+c=124
a+62=124
a=124-62
a=62
a+b=77
62+b=77
b=77-62
b=15
b)a+b=55 a=55-b
a+c=124 55-b+c=124
b+c=77
------------------------------------------------------
55-b+c+b+c=124+77
55+2c=201
2c=201-55
2c=146
c=146:2
c=73
a+c=124
a+73=124
a=124-73
a=51
b+c=77
b+73=77
b=77-73
b=4