16.
如图,菱形ABCD中,∠BAD=76°,AB的垂直平分线EF交AC于点F,则∠CFD的度数为( )
| A. | 86° | B. | 76° | C. | 66° | D. | 52° |
15.下列分式中,最简分式是( )
0 283778 283786 283792 283796 283802 283804 283808 283814 283816 283822 283828 283832 283834 283838 283844 283846 283852 283856 283858 283862 283864 283868 283870 283872 283873 283874 283876 283877 283878 283880 283882 283886 283888 283892 283894 283898 283904 283906 283912 283916 283918 283922 283928 283934 283936 283942 283946 283948 283954 283958 283964 283972 366461
| A. | $\frac{2+a}{{-4-4a-{a^2}}}$ | B. | $\frac{a-b}{b-a}$ | C. | $\frac{{{x^2}-4}}{x-2}$ | D. | $\frac{{{x^2}+{y^2}}}{x+y}$ |