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calculati sumele:2+4+6+...+200=

Răspuns :

 O faci suma gauss.
2(1+2+..+100)=
2(100x101):2=
10100

2×(1+2+3+...+100) = 2×(100×101:2)
= 2×(10100:2)
= 2×5050
= 10100