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Calcul.Sume. Siruri.
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52+53+54+...+86+87
2 502
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1+2+3+4+...+187
17 578
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Okay!
39+40+41+...+93
3630
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Okay!
1+2+3+4+...+ 236
27 966
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Okay!
45+46+47+...+78+79
2 170
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Okay!
1+2+3+4+... +195
19 110
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Okay!
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