Question

determinat numerelle naturale ,b,c stiind ca a <b<c si ca 9xax9xbx9xc=72

Answer 1

9a+9b+9c=72

9(a+b+c)=72

a+b+c=8

⇒a∈{0; 1; 2; 3; 4; 5; 6; 7}

⇒b∈{0; 1; 2; 3; 4; 5; 6; 7} l⇔a<b<c

⇒c∈{0; 1; 2; 3; 4; 5; 6; 7}