x3-27/-/33.计算(1) lim(2) limx-3>3X->3x-3x2+2x-8x2 +2x-8(3) lim(4) limx-2 x2 -3x+2x-→00 x2 - 3x + 2x3 -27(x -3)(x2 +3x+9)解lim(x? +3x +9)年(1)limlim27x-3x-3x->3x->3.-limS(2) lim3V/9x→3x-3(x -3)(/x2 +3/3.3/x + 3/9)x-→3(x - 2)(x+ 4)x+4x2+2x-8lim6 lim(3) lin x-1x→2(x-2)(x-1)x-→22x2-3x+2821+x2 +2x-8X1x(4) lim= lim322-3x+2x-X->001X3x1818 3. 计算 3 3 27 (1)lim x 3 x → x− − 3 3 3 3 (2)lim x 3 x → x − − 2 2 2 2 8 (3)lim x 3 2 x x → x x + − − + 2 2 2 8 (4) lim x 3 2 x x → x x + − − + 解 3 3 27 (1)lim x 3 x → x− − 2 3 ( 3)( 3 9) lim x 3 x x x → x − + + = − 2 3 lim( 3 9) 27 x x x → = + + = 3 3 3 3 (2)lim x 3 x → x − − 3 3 3 3 3 3 2 3 3 2 3 3 3 ( 3)( 3 9) lim ( 3)( 3 9) x x x x x x x → − +  + = − +  + 3 1 3 9 = 2 2 2 2 8 (3)lim x 3 2 x x → x x + − − + 2 ( 2)( 4) lim ( 2)( 1) x x x → x x − + = − − 2 4 lim 6 x 1 x → x + = = − 2 2 2 8 (4) lim x 3 2 x x → x x + − − + 2 2 2 8 1 lim 1 3 2 1 x x x x x → + − = = − +