2006数学二.pdf

2006 2006 106 , 05 55-62%80-83 38-45%60-63 2 07 306 06 07 U- 4 24 x +4 sin x 1 1y y 5x −2 cos x 5 4 sin x 1+ x 1 lim y lim x →∞ x →∞ 2 cos x 5 5 − x 2006 3 ⎧1 x 2 2f (x) ⎨⎪x 3 ∫0 sin t dt ,x ≠0 x 0 a 1 ⎪ 3 ⎩ a, x 0 sin x 2 1 lim f (x) lim 2 x →0 x →0 3x 3 2006 4 31 11 .2 +∞ xdx 1 3 ∫0 (1+x 2 )2 2