设F1,F2是椭圆x²/a²+y²/b²=1(a>b>0)的左,右焦点,P是直线x=3a/2上一点,△F2PF1是底角为30°的等腰三角形,则E的离心率为 ( )A 1/2 B 2/3 C 3/4 D 4/5|PF1|=根号下(3a/2+c)²+y0² 据勾股定
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![设F1,F2是椭圆x²/a²+y²/b²=1(a>b>0)的左,右焦点,P是直线x=3a/2上一点,△F2PF1是底角为30°的等腰三角形,则E的离心率为 ( )A 1/2 B 2/3 C 3/4 D 4/5|PF1|=根号下(3a/2+c)²+y0² 据勾股定](/uploads/image/z/3703921-25-1.jpg?t=%E8%AE%BEF1%2CF2%E6%98%AF%E6%A4%AD%E5%9C%86x%26%23178%3B%2Fa%26%23178%3B%2By%26%23178%3B%2Fb%26%23178%3B%3D1%28a%3Eb%3E0%29%E7%9A%84%E5%B7%A6%2C%E5%8F%B3%E7%84%A6%E7%82%B9%2CP%E6%98%AF%E7%9B%B4%E7%BA%BFx%3D3a%2F2%E4%B8%8A%E4%B8%80%E7%82%B9%2C%E2%96%B3F2PF1%E6%98%AF%E5%BA%95%E8%A7%92%E4%B8%BA30%C2%B0%E7%9A%84%E7%AD%89%E8%85%B0%E4%B8%89%E8%A7%92%E5%BD%A2%2C%E5%88%99E%E7%9A%84%E7%A6%BB%E5%BF%83%E7%8E%87%E4%B8%BA+%EF%BC%88+%EF%BC%89A+1%2F2+B+2%2F3+C+3%2F4+D+4%2F5%7CPF1%7C%3D%E6%A0%B9%E5%8F%B7%E4%B8%8B%EF%BC%883a%2F2%2Bc%29%26%23178%3B%2By0%26%23178%3B++++%E6%8D%AE%E5%8B%BE%E8%82%A1%E5%AE%9A)
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