Voi pune paranteze, ca sa se observe mai bine care cu care il adun..
a) 2+3+97+98
=(2+98)+(3+97)
=100+100
=200
b) 5+13+19+87+95+11
=(5+95)+(13+87)+(19+11)
=100+100+30
=230
c) 16+184+982+118+66+134
=(16+184)+(982+118)+(66+134)
=200+1100+200
=1500
d) 355+129+678+645+322+871
=(355+645)+(129+871)+(678+322)
=1000+1000+1000
=3000
