Question

Daca a/b=3/5,atunci valoarea raportului 3a-b/2a-b este:

Answer 1

a/b=3/5=›a=3k
.=b=5k
3a-b/2a-b=3·3k-5k/2·3k-5k=9k-5k/6k-5k=4k/1k=›=4

Answer 2

a/b = 3/5 =>5×a =3×b =>b = 5a/3
inlocuim in ecuatie pe b = 5a/3
3a-b / 2a-b = (3a-5a/3)/2a-5a/3 =
= (9a-5a)/3 /(6a-5a)/3=
= 4a/3 × 3/a = 4