江画工太猩院 A(r) y ∑ 2x 2n"= ∑x ,|x1 s(x)=∑(2n+x2 2x 0 1+x IxKI江西理工大学理学院 ′ ⎟⎠⎞ ⎜⎝⎛ − ∴ = x x A x 1 ( ) , (1 ) 1 2 − x = , (1 ) 2 2 2 0 x x nx n n − ∴∑ = ∞ = , | | 1 1 1 0 < − ∑ = ∞= x x x n n Q ∴ = ∑ + = ∞ =0 ( ) (2 1) n n s x n x + − 2 (1 ) 2 x x 1− x 1 . | | 1 (1 ) 1 2 < −+ = x xx