1u
1x(或解为:limx
x 0
2x2
e
eueu
lim lim ) u uu 1
1
x
1
1 2ex11
(e 1) lim limex 1; (10)limx(ex 1) lim
x x x x 11
2
xx
1
1e1/x 11/xx
lim 1) (或解为:∵当x 时,e 1~,∴limx(e 1) lim
x x 1/xx 1/xx
1
x
11ex 1 x(e 1)~xex 1 xex 11
(11)lim( x) lim lim lim ; x2x 0xx 0x 0x 0e 1x(e 1)x2x2
x
(12)lim(
x 1
x1xlnx x 1
) lim lim
x 1x 1x 1lnx(x 1)lnx
lnx1 lnx1
lim ; x 1x 1lnx 22lnx
x
xlnx x 1u x 1(u 1)ln(u 1) uln(u 1)~u(u 1)ln(u 1) u
lim lim(或解为:lim 2x 1(x 1)lnxu 0u 0uln(u 1)u
lim
ln(u 1)1
)
u 02u2
alimxln(1 )x x
(13)lim(1
x
ax
) ex
x 0
e
lim
aln(1 )
xlim
x
x
e
alimxx x
ea;
lim
tanxsinx x
(14)
x 0
limxsinx e
limsinxlnx
lnx
e
x 0 cscx
e
x 0 xcotxcscx
lim
1
e
x 0
e0 1;
1tanx
lime(15)lim()
x 0 xx 0
lnx
lim x 0cotx
lime
x 0
1
lim2 x 0 cscx
lime
x 0
sin2x
xx 0 lim
e0 1;
1
ex ln(1 x) 1(1 x2)(xex ex 1)x 1(16)lim lim limx 0x 0x 0x arctanx(x 1)x2
1
1 x2
ex
(xex ex 1)xex1 lim lim ;
x 0x 02xx22
(17)lim(1 sinx)
x 0
1
x
lime
x 0
ln(1 sinx)x 0xlim
lime
x 0
cosx
x 01 sinxlim
e;