设双曲线X²/a²-y²=1(a>0)焦点为F1,F 2,点p在双曲线左支上,向量PF1x向量PF2求离心率e
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![设双曲线X²/a²-y²=1(a>0)焦点为F1,F 2,点p在双曲线左支上,向量PF1x向量PF2求离心率e](/uploads/image/z/5303917-37-7.jpg?t=%E8%AE%BE%E5%8F%8C%E6%9B%B2%E7%BA%BFX%26%23178%3B%2Fa%26%23178%3B-y%26%23178%3B%3D1%EF%BC%88a%EF%BC%9E0%EF%BC%89%E7%84%A6%E7%82%B9%E4%B8%BAF1%2CF+2%2C%E7%82%B9p%E5%9C%A8%E5%8F%8C%E6%9B%B2%E7%BA%BF%E5%B7%A6%E6%94%AF%E4%B8%8A%2C%E5%90%91%E9%87%8FPF1x%E5%90%91%E9%87%8FPF2%E6%B1%82%E7%A6%BB%E5%BF%83%E7%8E%87e)
设双曲线X²/a²-y²=1(a>0)焦点为F1,F 2,点p在双曲线左支上,向量PF1x向量PF2求离心率e
设双曲线X²/a²-y²=1(a>0)焦点为F1,F 2,点p在双曲线左支上,向量PF1x向量PF2
求离心率e
设双曲线X²/a²-y²=1(a>0)焦点为F1,F 2,点p在双曲线左支上,向量PF1x向量PF2求离心率e
c^2=a^2+1
PF2-PF1=2a
PF1^2+PF2^2=(2c)^2=4c^2=4a^2+2PF1xPF2