16.
如图,线段AB上有2个点C、D,则以这4个点为端点的线段的条数是( )
| A. | 4 | B. | 5 | C. | 6 | D. | 7 |
15.解下列分式方程
(1)$\frac{3}{2x-2}+\frac{1}{1-x}=3$
(2)$\frac{1}{x+3}-\frac{2}{3-x}=\frac{12}{{x}^{2}-9}$.
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(1)$\frac{3}{2x-2}+\frac{1}{1-x}=3$
(2)$\frac{1}{x+3}-\frac{2}{3-x}=\frac{12}{{x}^{2}-9}$.