[题目]-|||-3.设 ,bin R, 证明:若对任何正数ε有 |a-b|lt c 则 =b.

证明:若对任何正数ε,有 |a-b|lt c, 则 =b.-|||-4.设 neq 0, 证明 |x+dfrac (1)(x)|geqslant 2, 并说明其

[题目]设 gt bgt 0 ,证明: dfrac (a-b)(a)lt ln dfrac (a)(b)lt dfrac (a-b)(b)

[题目]设 gt bgt 0, 证明: dfrac (a-b)(a)lt ln dfrac (a)(b)lt dfrac (a-b)(b).

[题目]设 gt bgt 0 ,证明: dfrac (a-b)(a)lt ln dfrac (a)(b)lt dfrac (a-b)(b)

[题目]设A,B为随机事件 (A)=0.7, (A-B)=0.-|||-3,则 P(AB)=?

设a＞b＞0，证明：(a-b)/(a)＜ln(a)/(b)＜(a-b)/(b)．设a＞b＞0，证明：$\frac{a-b}{a}$＜ln$\frac{a}{b}

[题目]设A、B是任意两个事件,则 (A-B)=-|||-).-|||-

11.设 gt bgt 0, 证明:-|||-dfrac (a-b)(a)lt ln dfrac (a)(b)lt dfrac (a-b)(b)

3.设A为 times n 矩阵,B是 times S 矩阵.若 =0, 则 (A)+R(B)leqslant n.

[单选题]设P(A)=a，P(B)=b，P(A∪B)=c，则P(A-B)=()。A.a-bB.c-bC.a(1-b)D.c-a