Răspuns :
ab + bd + dc+ ac=48
2ab +2ac=48
ab+ac=48
3ab=ac
ab=ac/3
ac/3+ac=24 amplificam cu 3
ac +3ac=72
ac=18
ab=6
2ab +2ac=48
ab+ac=48
3ab=ac
ab=ac/3
ac/3+ac=24 amplificam cu 3
ac +3ac=72
ac=18
ab=6