Răspunsuri

2014-10-18T22:05:52+03:00
A-b=45 
a/b=3/8 ->a=3b/8
3b/8-b=45
3b-8b=45*8
-5b=360
b=-360/5
b=-72
a=45-72=-27

2014-10-18T22:19:13+03:00
A-b=45
a/b=3/8  ⇒ a=3b/8
⇒3b/8-8=45  | ×8   (inmutim cu 8)
⇒3b-8b=360
 -5b=360
 b=360/(-5)
 b=-72   ⇒
⇒a-72=45
  a=45-72
 a=-27