10.设集合A={0,1,2,3,4},B={x∈R|$\frac{x-4}{x-2}$≤0},则A∩B=( )
A. | {1,2,3,4} | B. | {2,3,4} | C. | {3,4} | D. | {x|2<x≤4} |
7.若cosα+sinα=$\frac{2}{3}$,则$\frac{{\sqrt{2}sin(2α-\frac{π}{4})+1}}{1+tanα}$的值为( )
A. | -1 | B. | 0 | C. | $-\frac{5}{18}$ | D. | $-\frac{5}{9}$ |
6.若(a-2i)i2013=b-i,其中a,b∈R,i是虚数单位,则a2+b2等于( )
A. | 0 | B. | 2 | C. | $\frac{5}{2}$ | D. | 5 |
2.已知$\overline{z}$为复数z=i(1-i)的共轭复数,则z•$\overline{z}$=( )
0 250949 250957 250963 250967 250973 250975 250979 250985 250987 250993 250999 251003 251005 251009 251015 251017 251023 251027 251029 251033 251035 251039 251041 251043 251044 251045 251047 251048 251049 251051 251053 251057 251059 251063 251065 251069 251075 251077 251083 251087 251089 251093 251099 251105 251107 251113 251117 251119 251125 251129 251135 251143 266669
A. | -2 | B. | 2 | C. | 1-i | D. | 1+i |