1. 2 3 2×43×3 17
 = =
3 4 3×4 12
f  x =a n x nan−1 x n−1⋯a1 xa0
n
f  x =∑ a r x r
r =0
n
e=lim 1
n ∞
  1
n
N
=
 1
N
∑  xi −x 2
i=1
1
=2⋅  1−x 2 dx
∫
−1