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daca a/b = 3/5 atunci raportul 3a+b/3b-a este egal cu...?
VA ROG AJUTATI-MA DAU CORONITA


Răspuns :

daca a/b=3/5 atunci a=3b/5
calculam 3a+b=3*3b/5+b=9b/5+5b/5=14b/5
3b-a=3b-3b/5=15b/5-3b/5=12b/5
calculam raportul cerut
14b/5:12b/5= 14b/5*5/12b=14b/12b=14/12=7/6

a=3n si b=5n
Inlocuim
3*3n+5n/3*5n-3n=
9n+5n/15n-3n=
14n/12n=
14/12=1,1(6)