作者GayerDior ( 後庭内已自酥麻 ~_~)
看板trans_math
标题Re: [极限]可帮我看看这两题极限怎麽解吗..感恩
时间Wed Jan 31 19:07:06 2007
※ 引述《c1986 (=北商牛宝宝=)》之铭言:
lim cot(x/3) oo
x->0+ ---------- ( ~ ----)
cot(2x) oo
由罗必达法则
-csc(x/3)*(1/3) csc(x/3)
lim --------------- = lim -------------
原式 = x->0+ -2csc(2x) x->0+ 6 csc(2x)
sin(2x) 2x
lim ----------- lim ---------- = 1
= x->0+ 6 sin(x/3) = x->0+ 6*(x/3)
: 以及
lim ln(lnx) oo
x->00 ---------- (~ ----)
ln(x-ln(x)) oo
罗必达法则
1/(xlnx) x(x-lnx)
lim ------------------ = lim ------------------
x->oo [1-(1/x)]/(x-lnx) x->oo xlnx(x-1)
x-1 1
lim ---------- lim --------- = 0
= x->oo x-1-xlnx = x->oo 1-lnx -1
希望没算错...
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◆ From: 61.229.164.167
※ 编辑: GayerDior 来自: 61.229.164.167 (01/31 19:11)
1F:推 c1986:3q.....兆分感谢^^ 61.228.138.71 01/31 23:12