Răspunsuri

2014-07-24T11:33:46+03:00
Ab; cd ip cu 1/5 ; 1/7

ab * 1/5 = cd * 1/7 =k

ab/5=cd/7=k

ab=5k
cd=7k

ab+cd=36
5k+7k=36
12k=36
k=3

ab=5*3=15
cd=7*3=21

abcd=1521
1 5 1