已知切线方程2x+y=K,他是圆x²+y²=45的切线,求K A.5 B.10 C.15 D.20 E.25 最好有步骤急!这是pre-AP的题,我已经翻译好了,大侠帮帮忙
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![已知切线方程2x+y=K,他是圆x²+y²=45的切线,求K A.5 B.10 C.15 D.20 E.25 最好有步骤急!这是pre-AP的题,我已经翻译好了,大侠帮帮忙](/uploads/image/z/3702577-49-7.jpg?t=%E5%B7%B2%E7%9F%A5%E5%88%87%E7%BA%BF%E6%96%B9%E7%A8%8B2x%2By%3DK%2C%E4%BB%96%E6%98%AF%E5%9C%86x%26%23178%3B%2By%26%23178%3B%3D45%E7%9A%84%E5%88%87%E7%BA%BF%2C%E6%B1%82K+A.5+B.10+C.15+D.20+E.25+%E6%9C%80%E5%A5%BD%E6%9C%89%E6%AD%A5%E9%AA%A4%E6%80%A5%21%E8%BF%99%E6%98%AFpre-AP%E7%9A%84%E9%A2%98%2C%E6%88%91%E5%B7%B2%E7%BB%8F%E7%BF%BB%E8%AF%91%E5%A5%BD%E4%BA%86%2C%E5%A4%A7%E4%BE%A0%E5%B8%AE%E5%B8%AE%E5%BF%99)
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