x2-2x+3 (10)m3x+4 (11)im 3x3+5r+1 1+2x3 x2+7x (2)血1+x (13)m(m+i-m (15)m 1+(-l 月 x2-1 16)m2-x-可 (17)im 32-n+2 2n2+n-5 (二)利用勇一重要极限公式求下列极限 m2”轴是 (2)m动3a x-2snx -osin 5x (3)回x+smx 4)m。x 1-008x (5)m aresin x (6)im sn(-1) x 4 x-1 (7)m --l sn KX 1-cosx (8)im (9)lm xSi 0 xsnx (10)lim sinx-sina (11)m +x-1 (12) sx-1) x-a xsinx x2-1 uw》rm子 (14》im snx 证x一T (三)利用第二重要极限公式求下列极限 w of-引 6m0+s6-) ()m0+3x月 w o” (10)m0-2 (10) 3 4 2 3 lim 2 2 + − + → x x x x (11) x x x x x 7 3 5 1 lim 2 3 + + + → (12) x x x + + → 1 1 2 lim 3 3 (13) ( n n) n + − → lim 1 (14) − − → − 1 1 1 2 lim 2 x 1 x x (15) n n n 1 ( 1) lim + − → (16) 2 1 1 lim 2 2 1 − − − → x x x x (17) 2 5 3 2 lim 2 2 + − − + → n n n n n (二)利用第一重要极限公式求下列极限 (1) n n n x 2 lim 2 sin → (2) x x x sin 5 sin 3 lim →0 (3) x x x x x sin 2sin lim 0 + − → (4) 2 0 1 cos lim x x x − → (5) x x x arcsin lim →0 (6) ( ) 1 sin 1 lim 2 1 − − → x x x (7) x x x x sin 1 1 lim 2 0 − − → (8) x kx x sin lim →0 (9) x x x x sin 1 cos lim 0 − → (10) sin sin lim x a x a → x a − − (11) x x x x sin 1 1 lim 2 0 + − → (12) 1 sin( 1) lim 2 1 − − → x x x (13) 2 2 2 lim sin x x x→ (14) → x − x x sin lim (三)利用第二重要极限公式求下列极限 (1) x x x 3 1 lim 1 + → (2) x x x − → + 2 lim 1 (3) x x x − → 2 lim 1 (4) x x x 2 0 ) 3 3 lim ( → + (5) x x x 3sec 2 lim (1+ cos ) → (6) x x x x → 1+ lim (7) ( ) x x x 1 0 lim 1+ 3 → (8) x x x 2 1 lim 1 + → (9) 1 3 lim 1 + → + x x x (10) ( ) x x x 1 0 lim 1− 2 → (11) 2 3 1 lim( ) 2 1 x x x x + → + +