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S1=1+2+3+........+48 (prin doua metode)
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Răspuns :

Didi12342
S = 1 + 2 + 3 +... + 48
S = 48 × (48 + 1) : 2
S = 24 × 49
S = 1 176

(48 - 1) + 1 = 48 (termeni are sirul)
S = (48+1) × 48 : 2
S = 49 × 24
S = 1 176

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