a/b=3/2 atunci 2a+3b totul supra a-b = cu ..

Răspuns :

2a+3b/a-b=2*3+3*2/3-2
2a+3b/a-b=6+6/1
2a+3b/a-b=12/1
2a+3b/a-b=12
a / b = 3 / 2 ⇒ a = 3 b / 2 

 ( 2 × 3 b / 2    + 3 b ) : ( 3 b / 2 - b ) = →  / = ,,:"

= ( 3 b + 3 b ) : ( 3 b / 2 - 2 b / 2 ) =

= 6 b : b / 2 =

= 6 b × 2 / b =

= 12