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Gabrielaveronica
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(x+1)+(x+3)+...+(x+25)=338.
x=?

Răspuns :

Renatemambouko
(x+1)+(x+3)+...+(x+25)=338
pasul 3-1=2
(25-1) :2+1=12+1=13 termeni cifre
13 termeni de x
termen de mijloc 1+6x2=13
(x+1)+(x+3)+...+(x+25)=338
13x+6*(1+25)+13=338
13x+156+13=338
13x=338-169
13x=169
x=13


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