3a·2b/5a+b=1/3 atunci ab=?

Răspuns :

3a-2b/5a+b=1/3
(3a-2b)*3=(5a+b)*1
9a-6b=5a+b
9a-5a=6b+b
4a=7b rezulta ca a/b=7/4
(3a-2b)/(5a+b)=1/3
9a-6b=5a+b
4a=7b
a/b= 7
/4