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Cat ne da 2+4+8+...+50


Răspuns :

Răspuns:

2+4+8+...+50=64

2+4+8+64+50=129

Răspuns:

S=2x(1+2+3+...+25)

S1=1+2+3+...+25

S1=25+24+23+...+1

2S1=26+26+26+...+26

S1=(26x25):2

S1=13x25

S=2x13x25