Viorica23 Viorica23 09-03-2017 Matematică a fost răspuns Fie proportia a/b=2/5.calculati: a)a/a+b b)a/a-b; c)a+b/b; d)b-a/b; e)3a/5b; f)3a+2b/5b; g)5a/b; h)a/7b; i)a:3/b:3; j)a:9/b; k)a/b:3; l)2a+3b/4b; m)5b-3a/2a+5b; n)4b-2a/3a+b; o)a+7b/6b-3a.