(2)
N(x)=1+8x+3x(x 1) 2.75x(x 1)(x 2)
+1.875x(x 1)(x 2)(x 4),
x=4.2
f(4.2)≈N(4.2)=4.696.
4.
p(x)=x4 x3+x2 x+1
-2p(x)
(
2-12).2
05
1
61
x
31
-112-13
111
3
:
2-12
2-13
p(x) q(x)
x=0,±1,±2
p(x) q(x)=Ax(x 1)(x+1)(x 2)(x+2),
x=3
A=31
120
x(x 1)(x+1)(x 2)(x+2).
5.
(
2-14)
-2y
4
16
2
-4