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85问答库 > 求两道高二数学题（关于双曲线与抛物线），急急急！

求两道高二数学题（关于双曲线与抛物线），急急急！

2025-04-03 22:51:10

推荐回答（1个）

回答1：

1.F1(-5,0),F2(5,0)
PM≥PF1-2，PN≤PF2+1
所以 PM-PN最小值
=PF1-2-（PF2+1）=（PF1-PF2）-3=6-3=3
2,y^2=4x上一点Q到焦点F的距离等于到其准线的距离，画出图来
易知：当点Q与点B纵坐标相同时，距离和最小。
所以点Q的坐标为：（1/4，1）

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