8 urgent va roggggggggggggggg

8 Urgent Va Roggggggggggggggg class=

Răspuns :

a/b=3x15/90
a/b=45/90
a/b=1/2, 2a=b
(2a+b)/(3a-b)=(b+b)/(3a-2a)=2b/a=4a/a=4