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Calculeaza S=11plus12plus13plus...plus101

Răspuns :

CleverGirly
S=11+12+13+....+101
S=101+100+99+.....+11
2S=112+112+112+....+112
2S=112·(1+1+1+...+1)
2S=112·101
S=101·112:2
S=101·56
iar multimea S=101·56 (daca vrei calculezi)
Aleale20005
11+12+13+......+101=(11+101)+(12+100)+(13+99)……=112×41

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