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Calculați suma
S=11+22+...+99+111+222+...+999+1111+2222+...+9999.​

Răspuns :

Lucasela

S=11+22+...+99+111+222+...+999+1111+2222+...+9999

S=11(1+2+3+...+9)+111(1+2+3+....+9)+1111(1+2+3+....+9)

S=(1+2+3+...+9)(11+111+1111)

S=1233·9·10/2

S=1233·45

S=55485

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