5.已知定义在R上的函数f(x)=2|x-m|-1(m为实数)为偶函数,记a=f(2-3),b=f(3m),c=f(log0.53),则( )
A. | a<b<c | B. | a<c<b | C. | c<a<b | D. | c<b<a |
18.已知定义在R上的函数f(x)=$\left\{\begin{array}{l}{x^2}+2,x∈[0,1)\\ 2-{x^2},x∈[-1,0)\end{array}$且f(x+2)=f(x).若方程f(x)-kx-2=0有三个不相等的实数根,则实数k的取值范围是( )
A. | $(\frac{1}{3},1)$ | B. | $(-\frac{1}{3},-\frac{1}{4})$ | C. | $(\frac{1}{3},1)∪(-1,-\frac{1}{3})$ | D. | $(-\frac{1}{3},-\frac{1}{4})∪(\frac{1}{4},\frac{1}{3})$ |
17.设p:$\frac{2x-1}{x-1}≤0$,q:x2-(2a+1)x+a(a+1)<0,若p是q的充分不必要条件,则实数a的取值范围是( )
A. | $(0,\frac{1}{2})$ | B. | $[0,\frac{1}{2})$ | C. | $(0,\frac{1}{2}]$ | D. | $[\frac{1}{2},1)$ |
16.给出下列命题:
①若给定命题p:?x∈R,使得x2+x-1<0,则?p:?x∈R,均有x2+x-1≥0;
②若p∧q为假命题,则p,q均为假命题;
③命题“若x2-3x+2=0,则x=2”的否命题为“若 x2-3x+2=0,则x≠2,
其中正确的命题序号是( )
0 251729 251737 251743 251747 251753 251755 251759 251765 251767 251773 251779 251783 251785 251789 251795 251797 251803 251807 251809 251813 251815 251819 251821 251823 251824 251825 251827 251828 251829 251831 251833 251837 251839 251843 251845 251849 251855 251857 251863 251867 251869 251873 251879 251885 251887 251893 251897 251899 251905 251909 251915 251923 266669
①若给定命题p:?x∈R,使得x2+x-1<0,则?p:?x∈R,均有x2+x-1≥0;
②若p∧q为假命题,则p,q均为假命题;
③命题“若x2-3x+2=0,则x=2”的否命题为“若 x2-3x+2=0,则x≠2,
其中正确的命题序号是( )
A. | ① | B. | ①② | C. | ①③ | D. | ②③ |