高中數學主題練習—過定點之弦中點軌跡圓

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高中數學主題練習—過圓外一點之切線

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高中數學主題練習—線與圓之關係

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過定點之弦中點軌跡圓（一）

<div class="lexical__image center"><div class="lexical__imageWrapper"><img src="https://resize-image.vocus.cc/resize?compression=6&amp;norotation=true&amp;url=https%3A%2F%2Fimages.vocus.cc%2Ff779dd70-d018-4ead-8de2-bbe6c938df33.png&amp;width=740&amp;sign=txp3dEFjCDAdp0FrpK2FdPVYGJ2brlS81eEzp8ELm-k" fetchpriority="high" data-src="https://resize-image.vocus.cc/resize?compression=6&amp;norotation=true&amp;url=https%3A%2F%2Fimages.vocus.cc%2Ff779dd70-d018-4ead-8de2-bbe6c938df33.png&amp;width=740&amp;sign=txp3dEFjCDAdp0FrpK2FdPVYGJ2brlS81eEzp8ELm-k" data-loaded="true" data-original-src="https://images.vocus.cc/f779dd70-d018-4ead-8de2-bbe6c938df33.png" data-lowquality="false" data-width="1494" data-height="764" data-retry="0" onerror="Number(this.dataset.retry) > 4 ? this.src='/static/default-error-img.svg': (() => {this.src=this.dataset.originalSrc; this.dataset.retry = Number(this.dataset.retry)+1;})()" data-istopthreeimage="true" alt="raw-image"></div><div></div></div><hr><h2 class="lexical__h2" dir="ltr"><span style="white-space: pre-wrap;">解答：</span></h2><div class="lexical__image center"><div class="lexical__imageWrapper"><img src="https://resize-image.vocus.cc/resize?compression=6&amp;norotation=true&amp;url=https%3A%2F%2Fimages.vocus.cc%2F091c15a7-3715-4780-a8b3-6e0bcbd5f47b.png&amp;width=572&amp;sign=Lz4wJgpnEGG7ZlKfPPvBIIG4Y-gyIemCYsTlM5CimzY" fetchpriority="high" data-src="https://resize-image.vocus.cc/resize?compression=6&amp;norotation=true&amp;url=https%3A%2F%2Fimages.vocus.cc%2F091c15a7-3715-4780-a8b3-6e0bcbd5f47b.png&amp;width=572&amp;sign=Lz4wJgpnEGG7ZlKfPPvBIIG4Y-gyIemCYsTlM5CimzY" data-loaded="true" data-original-src="https://images.vocus.cc/091c15a7-3715-4780-a8b3-6e0bcbd5f47b.png" data-lowquality="false" data-width="572" data-height="458" data-retry="0" onerror="Number(this.dataset.retry) > 4 ? this.src='/static/default-error-img.svg': (() => {this.src=this.dataset.originalSrc; this.dataset.retry = Number(this.dataset.retry)+1;})()" data-istopthreeimage="true" alt="raw-image"></div><div></div></div><p class="lexical__paragraph"><br></p><p class="lexical__paragraph" dir="ltr"><br></p><p class="lexical__paragraph" dir="ltr"><div class="ad-placeholder" style="min-height: 124px;"></div><br></p>