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urgent pls help............

Urgent Pls Help class=

Răspuns :

Răspuns:

a=2+4+6+...+100+51

a=2(1+2+...+50)+51

a=2×50×51:2+51

a=50×51+51

a=51(50+1)

a=51×51 pătrat perfect

sper ca te am ajutat