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Suma a 6 nr consecutive este 75,afflato nr

Răspuns :

[tex]a+a+1+a+2+a+3+a+4+a+5=75\\ 6a+15=75\\ 6a=75-15\\ 6a=60\\ a=60:6\\ a=10\\\\ a+1=11\\ a+2=12\\ a+3=14\\ a+4=15\\ a+5=16\\\\\\ Proba:10+11+12+13+14+15=75[/tex]