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a+b+c+d=?
a=187
b cu 23 mai mare decat a
c=a+b
d=c-b


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
a+b+c+d=187+187+23+187+187+23+187+187+23-187+23=187+200+387+187=374+587=961