Question

Dacă a/b=3/5 ,atunci valoarea raportului 3a-b/2a-b este:
a)1; b)9/10; c)4; d)3/2

Answer 1

a/b = 3/5 ==> a = 3b/5
(3a-b)/(2a-b) =

= (9b/5 - b)/(6b/5 - b) =

= (9b-5b)/5 × 5/(6b-5b) =

= 4b/5 × 5/b =

= 4b/b =

= 4

varianta c) este corecta