Răspuns :
a+b+c=212
b:a=3r5
c:b=2r7
b=3a+5
c=2b+7=>2(3a+5)+7=>6a+10+7=>6a+17
inlocuim bsi c
a+3a+5+6a+17=212
10a=212-17-5
a=190:10
a=19
b=3x19+5=62
c=2x62+7=131
b:a=3r5
c:b=2r7
b=3a+5
c=2b+7=>2(3a+5)+7=>6a+10+7=>6a+17
inlocuim bsi c
a+3a+5+6a+17=212
10a=212-17-5
a=190:10
a=19
b=3x19+5=62
c=2x62+7=131
a+b+c=212
b;a=3rest5 b=3a+5
c;b=2 rest7 c=2b+7
a+3a+5+2x(3a+5)+7=212
a+3a+5+6a+10+7=212
10a=212-22
10a=190
a=19
b=3x19+5
b=62
c=2x62+7
c=131
19+62+131=212
b;a=3rest5 b=3a+5
c;b=2 rest7 c=2b+7
a+3a+5+2x(3a+5)+7=212
a+3a+5+6a+10+7=212
10a=212-22
10a=190
a=19
b=3x19+5
b=62
c=2x62+7
c=131
19+62+131=212