Răspuns :
a+b+c=870
a+b=644 c=870-644=226
b+c=453 b=453-226=227
a=644-277=417
a+b=644 c=870-644=226
b+c=453 b=453-226=227
a=644-277=417
a+b+c=870
a+b=644
644+c=870
c=870-644
c=226
b+c=453
b+226=453
b=453-226
b=227
a+227=644
a=644-227
a=417
417+227+226=870
a+b=644
644+c=870
c=870-644
c=226
b+c=453
b+226=453
b=453-226
b=227
a+227=644
a=644-227
a=417
417+227+226=870