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Din suma nr.pare cel mult egale cu 20 scade suma nr.impare cel mult egale cu 20



Răspuns :

2+4+6+8+10+12+14+16+18+20=110
1+3+5+7+9+11+13+15+17+19=100
110-100=10
(2+4+6+8+10+12+14+16+18+20)-(1+3+5+7+9+11+13+15+17+19)=110-100=10