Buna dimineata va rog rezolvare detaliata ex 5
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Răspuns:
[tex]ab+ba=77\\\\10a+b+10b+a=77\\\\11a+11b=77\\\\11(a+b)=77\\\\a+b=77:11\\\\a+b=7\\\\a\neq 0;b\neq 0\\ \\a=1;b=6= > 16+61=77\\\\a=2;b=5= > 25+52=77\\\\a=3;b=4= > 34+43=77\\\\a=6;b=1= > 61+16=77\\\\a=5;b=2= > 52+25=77\\\\a=4;b=3= > 43+34=77[/tex]