5.已知函数f(x)=|log2(x-1)|,g(x)=($\frac{1}{2}$)x,则图象交于A(x1,y1),B(x2,y2)两点,则( )
A. | x1•x2<1 | B. | x1+x2>5 | C. | x1+x2>x1•x2 | D. | x1+x2<x1•x2 |
3.已知等差数列{an}的前n项和为Sn,若(a2-1)3+2010(a2-1)=1,(a2009-1)3+2010(a2009-1)=-1
,下列为真命题的序号为( )
①S2009=2009;②S2010=2010;③a2009<a2;④S2009<S2.
,下列为真命题的序号为( )
①S2009=2009;②S2010=2010;③a2009<a2;④S2009<S2.
A. | ①② | B. | ②③ | C. | ②④ | D. | ③④ |
2.过点M(3,2)的抛物线方程是( )
A. | x2=$\frac{9}{2}$y | B. | y2=$\frac{4}{3}$x | C. | y2=$\frac{4}{3}$x或 x2=$\frac{9}{2}$y | D. | y2=$\frac{3}{4}$x或x2=$\frac{2}{9}$y |
1.若关于x的不等式3-|x-a|>x2至少有一个负数解,则实数a的取值范围是( )
0 249821 249829 249835 249839 249845 249847 249851 249857 249859 249865 249871 249875 249877 249881 249887 249889 249895 249899 249901 249905 249907 249911 249913 249915 249916 249917 249919 249920 249921 249923 249925 249929 249931 249935 249937 249941 249947 249949 249955 249959 249961 249965 249971 249977 249979 249985 249989 249991 249997 250001 250007 250015 266669
A. | $-3<a<\frac{13}{4}$ | B. | $-\frac{13}{4}<a<\frac{13}{4}$ | C. | -3<a<3 | D. | $-\frac{13}{4}<a<3$ |