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Descompuneti in factori primi suma S=1+2+3+4+...+50

Răspuns :

S=1+2+3+4+...+50=50×(50+1):2=50×51:2=2550:2=1275

S=1+2+3+4+...+50=

= 50×(50+1)÷2 =

= 50×51÷2 =

= 2550:2 =

= 1275