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x/2 + 2x/2 + 3x/2 + ... + 34x+2 =35 *17 rezolvati ecuatia

Răspuns :

x/2 + 2x/2 + 3x/2 + ... + 34x/2 =35 *17
x/2(1+2+3....+34)=35*17
x/2(34)(34+1)/2=35*17
x/2 *17*35=35*17
x/2=1
x=2