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(a+1)+(a+3)+(a+5)+...+(a+101)=2703 a=?

Răspuns :

(a+1)+(a+3)+(a+5)+.......+(a+101)=2703

a+a+a+..+a+(1+3+5+..101)=2703

a+a+a+..+a+(1+3+5+..2x50+1)=2703

ax51+(50+1)²=2703

ax51+51²=2703

ax51+2601=2703

ax51=2703-2601
ax51=102
a=102:51
a=2