Răspuns :
a+b+c=777
a-c=b+c =>a=b+2c
c=b:2 =>b=2c
a+b+c=b+2c+b+c=2b+3c=777
2x2c+3c=777
7c=777 =>c=111
b=222
a=444
a-c=b+c =>a=b+2c
c=b:2 =>b=2c
a+b+c=b+2c+b+c=2b+3c=777
2x2c+3c=777
7c=777 =>c=111
b=222
a=444
c=b:2 deci b=2*c
a-c=b+c 2c=a-b a=2c+b=2c+2c=4c
a+b+c=777 4c+2c+c=777
7c=777 c=777:7=111
b=2*111 =222
a=4*111=444
a-c=b+c 2c=a-b a=2c+b=2c+2c=4c
a+b+c=777 4c+2c+c=777
7c=777 c=777:7=111
b=2*111 =222
a=4*111=444