证明：当x>1时，ln x+dfrac (4)(x+1)-2gt 0 0" data-width="196" data-height="46" data-size="2112" data-format="png" style="max-width:100%">

证明:当x>0时,有不等式^2xgt x+sin x+cos xx+sin x+cos x" data-width="203" data-height="26"

函数(x)=(x)^2-2ln x, gt 00" data-width="213" data-height="28" data-size="2326" dat

若x = 0 是函数f(x)= ,xgt 0 a+xsin dfrac {2)(x),xlt 0 ." data-width="180" data-heig

已知 f(x)= ,xgt 0 1 ,x=0 arctan dfrac {2)(x)+a xlt 0" data-width="552" data-

01 + x ^ 2 , x le 0." data-width="202" data-height="53" data-size="4250" data-fo

X1,X2,···,Yn是来自总体X1,X2,···,Yn的简单随机样本,参数X1,X2,···,Yn0" data-width="49" data-heigh

设y=y(x)满足方程 y=y(x) 0 ) " data-width="252" data-height="33" data-size="2950" data

0, & t_(m)0. & " data-width="268" data-height="71" data-size="4643" data

设随机变量X1,X 2独立同分布,其概率密度函数为-|||-f(x)= ) (e)^-x,xgt 0 0," data-width="617" data-h

设随机变量序列X1,X2,···独立同分布，X1,X2,···0(i=1,2,dots)" data-width="338" data-height="27"