1.“点M在曲线y=|x|上”为什么是“点M到两坐标轴的距离相等”的充分不必要条件?2.过点P(2,1)作圆C:x²+y²-ax+2ay+2a+1=0的切线有两条,则a的取值范围是?-5/2)∪(2,0)而我用“P到圆心的距
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![1.“点M在曲线y=|x|上”为什么是“点M到两坐标轴的距离相等”的充分不必要条件?2.过点P(2,1)作圆C:x²+y²-ax+2ay+2a+1=0的切线有两条,则a的取值范围是?-5/2)∪(2,0)而我用“P到圆心的距](/uploads/image/z/5901904-64-4.jpg?t=1.%E2%80%9C%E7%82%B9M%E5%9C%A8%E6%9B%B2%E7%BA%BFy%3D%7Cx%7C%E4%B8%8A%E2%80%9D%E4%B8%BA%E4%BB%80%E4%B9%88%E6%98%AF%E2%80%9C%E7%82%B9M%E5%88%B0%E4%B8%A4%E5%9D%90%E6%A0%87%E8%BD%B4%E7%9A%84%E8%B7%9D%E7%A6%BB%E7%9B%B8%E7%AD%89%E2%80%9D%E7%9A%84%E5%85%85%E5%88%86%E4%B8%8D%E5%BF%85%E8%A6%81%E6%9D%A1%E4%BB%B6%3F2.%E8%BF%87%E7%82%B9P%EF%BC%882%2C1%EF%BC%89%E4%BD%9C%E5%9C%86C%EF%BC%9Ax%26sup2%3B%2By%26sup2%3B-ax%2B2ay%2B2a%2B1%3D0%E7%9A%84%E5%88%87%E7%BA%BF%E6%9C%89%E4%B8%A4%E6%9D%A1%2C%E5%88%99a%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%E6%98%AF%3F-5%2F2%EF%BC%89%E2%88%AA%282%2C0%29%E8%80%8C%E6%88%91%E7%94%A8%E2%80%9CP%E5%88%B0%E5%9C%86%E5%BF%83%E7%9A%84%E8%B7%9D)
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