11.使分式$\frac{{x}^{2}+1}{1-2x}$的值为负的x的取值范围是( )
| A. | x<0 | B. | x<$\frac{1}{2}$ | C. | x$≥\frac{1}{2}$ | D. | x$>\frac{1}{2}$ |
8.在平面直角坐标系xOy中,对于点P(x,y),我们把点P1(-y+1,x+1)叫做点P的伴随点,已知点A1的伴随点为A2,点A2的伴随点为A3,点A3的伴随点为A4,…,这样依次得到点A1,A2,A3,…,An,若点A1的坐标为(3,1),则点A2015的坐标为( )
0 282758 282766 282772 282776 282782 282784 282788 282794 282796 282802 282808 282812 282814 282818 282824 282826 282832 282836 282838 282842 282844 282848 282850 282852 282853 282854 282856 282857 282858 282860 282862 282866 282868 282872 282874 282878 282884 282886 282892 282896 282898 282902 282908 282914 282916 282922 282926 282928 282934 282938 282944 282952 366461
| A. | (0,4) | B. | (-3,1) | C. | (0,-2) | D. | (3,1) |