lim趋近于2 x^3 2x^2 (x-2)^2

原式=lim(x->0)e^[cot²xln(cosx)]=e^[lim(x->0)ln(cosx)/tan²x]=e^[lim(x->0)ln(cosx)/x²]=e^

算出是- 1/2等价无穷小 + 洛必达法则当x→0时ln(1 + x) ~ xln[x + √(1 

lim(tan^3(3x)/(X^2sin(2x))=(27/2)*lim{[tan^3(3x)/(3x)^3]*[2X/sin(2x)]}=27/2或用洛彼得法则

[(x-1)/(x+1)]^(x+2)=[1-2/(x+1)]^(x+2)lett=(x+1)/2[(x-1)/(x+1)]^(x+2)=[1-1/t]^(2t+1)=[(1-1/t)^t]^2*(1

lim(x-->0)(sinx)^2/2x=lim(x->0)x^2/2x=lim(x->0)x/2=0所以当x->0时,(sin)x^2是2x的低阶无穷小极限值是相等的均为0

lim(x趋近于0)[6+f(x)]/x^2=lim(x趋近于0)6/x^2+lim(x趋近于0)f(x)/x^2=lim(x趋近于0)sin6x/x^3+lim(x趋近于0)xf(x)/x^3=li

lim(sin3x/sin5x)x趋近于0=lim3/5(5xsin3x/3xsin5x)x趋近于0=3/5lim[2x²/（1-cosx)]x趋近于0=lim[2x²/（2sin

y=lim(x->0)[(4^x-5^x)/2]^1/xlny=lim(x->0)ln[1+(4^x-5^x-2)/2]/x=lim(x->0)(4^x-5^x-2)/x=ln4-ln5=ln(4/5

1.lnx*ln(1+x)=ln(1+x)/(1/lnx)=[1/(1+x)][-1/(lnx)^2*1/x]=x(lnx)^2/(1+x)=(lnx)^2/(1+1/x)=[2lnx/x]/(-1/

解法一：∵lim(x->π/2)[(sinx-1)tanx]=lim(x->π/2){[(sinx-1)/cosx]sinx}=lim(x->π/2)[(sinx-1)/cosx]*lim(x->π/

用两次洛必达法则lim（x趋近于0）（e^x-cosx-x）/√(1+x^2)-1用洛必达法则=lim（x趋近于0）(e^x+sinx-1)/x*√(1+x^2)=lim（x趋近于0）(e^x+sin

由洛必达法则,lim(x→0)(2^x+3^x-2)/x=lim(x→0)[(2^x)(ln2)+(3^x)(ln3)]/1=ln6.=========如果没学洛必达法则,但学了等价无穷小量,见解法2

lim(x趋近于正无穷)[(根号下x^2+2x)-x]=lim(x趋近于正无穷)[(根号下x^2+2x)-x][(根号下x^2+2x)+x]/[(根号下x^2+2x)+x]=lim(x趋近于正无穷)[

取倒数,得原式=1/[lim[(x^2)+1)/x^2]^xx趋近无穷大]=1/[lim[(1+1/x^2]^xx趋近无穷大]=1/e^lim(x->∞)x/x^2=1/e^0=1

令u=1/x原式=lim[u-ln(1+u)]/u²=lim[1-1/(1+u)]/(2u)=lim1/[2(1+u)]=1/2

X正无穷则答案为0x负无穷则答案是无穷怎么可能,存在的啊再问：我觉得是那打错了题上写的是趋近于正无穷时给的答案不存在我觉得不对再答：恩是打错了，你可以去问一下同学嘛，括号里面的约分之后就是1/2，1/

lim(x^2*arcsin1/x)/4x-1,x→∞,1/x→0,等价无穷小代换,1/x→0,1/x~sin(1/x),arcsin1/x→1/x,则lim(x^2*arcsin1/x)/4x-1=

两个分母一样?你没写错吗?假设不错则原式=3/(x²-x)分母趋于0,所以原式趋于无穷所以极限不存在

lim(x趋近于2)(ln(x^2-3)/(x^2-3x+2))=lim(x趋近于2)(ln(x^2-4+1)/(x-2)(x-1)=lim(x趋近于2)[ln(x^2-4+1)^(1/(x-2))]

lim(sqrt(x+2)-sqrt(x))/(sqrt(x+1)-sqrt(x))分子分母同乘以(sqrt(x+2)+sqrt(x))*(sqrt(x+1)+sqrt(x))就变成lim2(sqrt