A1: 1
A2: 2
A3: 3
A4: 4
B1: 0.7
B2: 3.4
B3: 8.8
B4: 15.3
A: (A1, B1)
B: (A2, B2)
C: (A3, B3)
D: (A4, B4)
lista1: {A, B, C, D}
f = FitPoly(lista1, 2)