Răspuns :
b=187+23
b=210
c=187+210
c=397
d=397-210
d=187
a+b+c+d=187+210+397+187
=981
b=210
c=187+210
c=397
d=397-210
d=187
a+b+c+d=187+210+397+187
=981
a+b+c+d=187+187+23+187+187+23+187+187+23-187+23=187+200+387+187=374+587=961