| 2026年高考数学新高考Ⅱ-4 |
|
2026-10-10 17:44:19 |
|
|
(5分)已知双曲线$C:\dfrac{x^{2}}{a^{2}}-\dfrac{y^{2}}{b^{2}}=1(a > 0,b > 0)$过点$(1,0)$和$(\dfrac{\sqrt{7}}{2}$,$3)$,则双曲线$C$的渐近线方程是( ) A.$y=\pm 3\sqrt{2}x$ B.$y=\pm 2\sqrt{3}x$ C.$y=\pm \dfrac{\sqrt{3}}{6}x$ D.$y=\pm \dfrac{\sqrt{2}}{6}x$ 〖答案〗$B$ 〖分析〗根据两点求出$a$,$b$,然后求出渐近线方程即可. 〖解答〗解:$\because$过点$(1,0)$, $\therefore a=1$, $\because$过点$(\dfrac{\sqrt{7}}{2}$,$3)$, $\therefore$$\dfrac{7}{4}-\dfrac{9}{{b}^{2}}=1$, 解得:$b=2\sqrt{3}$, $\therefore$渐近线方程为:$y=\pm 2\sqrt{3}x$. 故选:$B$. 〖点评〗本题主要考查了双曲线渐近线方程的求解,属于基础题.
|
|
http://x.91apu.com//shuxue/gkt/2026/2026xgk2/2026-10-10/34476.html |