第三章作业选讲√.pdfVIP免费

A组1（2）、以下两种方法都正确23230233203203'()lim11lim23lim23xxxxxxfxxxxxxxxxxx23230220423324334203324333'()limlim2lim23xxxxxxfxxxxxxxxxxxxxxxxxxxxx3（3）、000000000000000000000000()(2)lim()()()(2)lim()()()(2)limlim()()(2)()lim2lim2()()lim2limxxxxxxxhfxxfxxxfxxfxfxfxxxfxxfxfxfxxxxfxxfxfxxfxxxfxxfxx000()()3'()fxhfxhfx3（4）、000000000000000000000000000()()lim()()()()lim()()()()limlim()()()()limlim()()()()limlim2'()hhhhhhhhfxhfxhhfxhfxfxfxhhfxhfxfxfxhhhfxhfxfxhfxhhfxhfxfxhfxhhfx9、注：由于()x不一定可导，因此我们只能用定义来做！000()()f'()lim()limlim()()hhhfahfaahhahhaha连续13（18）、2222222y=arctaneln11arctaneln211arctanelnln121arctanexln12xxxxxxxxxxxeeeeeee2222222e12ey'=1121ee111e11xxxxxxxxxxeeeee