xy
. 25.1 −
, y x. .
, . , , m -:
y=a0+a1×x+a2×x2++am×xm.
, , ..
a0,a1,a2,,am f(x,a0,a1,a2,am), .
a0,a1,a2,,am , :
(25.1)
, (25.1) a0,a1,a2,,am . .
. a0,a1,a2
y=a0+a1×x+a2×x2 (25.2)
(25.1) :
:
(25.3)
(25.3) a0, a1, a2.
(25.2)
1. n, x1, x2,xn, y1, y2,yn.
2. (21.3):
a1,2= , a1,3= , a2,3= , a3,3= ,
b1= , b2= , b3= ;
a1,1=n, a2,1= a1,2, a2,2= a1,3, a3,1= a1,3, a3,2= a2,3.
3. (25.3) A×Z=B, A , B , Z , z1=a0, z2=a1, z3=a2.
4. a0, a1, a2.
5. d1, d2,dn.