Răspunsuri

2014-11-03T16:48:26+02:00
P+2f=155=>p=155-2f

2p+f=145
f+p=??

2p+f=145
2(155-2f)+f=145
310-4f+f=145
310-3f=145/-310
-3f=-165/:-3
f=55

2p+55=145/-55
2p=90/:2
p=45
Raspuns:f+p=55+45=100 lei