19.若分式x2-12(x+1)的值等于0,则x的值为( )
| A. | 1 | B. | ±1 | C. | 12 | D. | -1 |
17.
如图,在方格中作以AB为一边的Rt△ABC,要求点C也在格点上,这样的Rt△能作出( )
| A. | 3个 | B. | 4个 | C. | 5个 | D. | 6个 |
16.
如图,⊙O的直径AB=8,∠CBD=30°,则CD等于( )
0 307746 307754 307760 307764 307770 307772 307776 307782 307784 307790 307796 307800 307802 307806 307812 307814 307820 307824 307826 307830 307832 307836 307838 307840 307841 307842 307844 307845 307846 307848 307850 307854 307856 307860 307862 307866 307872 307874 307880 307884 307886 307890 307896 307902 307904 307910 307914 307916 307922 307926 307932 307940 366461
| A. | 1 | B. | 2 | C. | 3 | D. | 4 |