1.分式方程$\frac{1}{2x}=\frac{2}{x+3}$的解为( )
| A. | x=-3 | B. | x=-1 | C. | x=0 | D. | x=1 |
15.解方程组$\left\{\begin{array}{l}{17x-2y=8①}\\{13x-4y=-10②}\end{array}\right.$时,消去未知数y最简单的方法是( )
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| A. | ①×4-②×2 | B. | ①×2-② | ||
| C. | 由①得y=$\frac{17x-8}{2}$,再代入② | D. | 由②得$\frac{13x+10}{4}$,再代入① |