2.已知角α的终边上一点P的坐标是(-1,$\sqrt{3}$),则角α在0°~360°范围内的值是( )
| A. | 30° | B. | 45° | C. | 60° | D. | 120° |
19.若复数z满足z(1-i)=i2017(i是虚数单位),则复数z等于( )
| A. | $\frac{1}{2}$+$\frac{1}{2}$i | B. | -$\frac{1}{2}$-$\frac{1}{2}$i | C. | -$\frac{1}{2}$+$\frac{1}{2}$i | D. | $\frac{1}{2}$-$\frac{1}{2}$i |
16.已知x,y满足$\left\{\begin{array}{l}{x+2y≤4}\\{x-y≤1}\\{x+2≥0}\end{array}\right.$,目标函数z=1-2x-y的最大值为a,最小值为b,则a-b=( )
0 227755 227763 227769 227773 227779 227781 227785 227791 227793 227799 227805 227809 227811 227815 227821 227823 227829 227833 227835 227839 227841 227845 227847 227849 227850 227851 227853 227854 227855 227857 227859 227863 227865 227869 227871 227875 227881 227883 227889 227893 227895 227899 227905 227911 227913 227919 227923 227925 227931 227935 227941 227949 266669
| A. | 10 | B. | 12 | C. | 14 | D. | 16 |