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ajutatima la matematica clasa a V, 3+6+9+12.....+3000

Răspuns :

MariaDN
S=3+6+..+3000
S= 3 ×(1+2+3+...+1000)
S= 3×[tex] \frac{1000*1001}{2} [/tex]
S= 3 ×[tex] \frac{1001000}{2} [/tex]
S= 3 ×500500
S= 1501500
CosmoteRo
3(1+2+3+4+...1000)=3x(1000x1001):2=3003000:2=15015000

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