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S=2 +4+ 6+ 8+ 10+ ...+ 222

Răspuns :

S = 2x ( 1 + 2 + 3 + ...... + 111) S = 111x112x2/2 S = 111x112 S = 12432
S=(2+222) X 111 :2
S=224 X 111: 2
S= 24864 : 2
S=12432