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Cristinasaracrowa84e
a fost răspuns

Determina nr natural x:
X+2× x+3×x.........+10× x=385

Răspuns :

Iakabcristina2
x(1+2+3+...+10)=385
x•55=385
x=7
X*(1+2+3+....+10)=385
(10+1)*10:2=55
X*55=385
X=385:55
X=7

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