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a fost răspuns

rezolvati ecuatiile x+(x+1)+(x+2)+......+(x+11)=78

Răspuns :

Diana1110
12x+(12x13):2=78
12x+78=78
12x=0
x=0
NeverGiveUp1
12X+12×13:2=78
12X=0, d-ce 12X+78=78
X=0

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