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(2,2√2)畫一個45°的角,頂點為B,在一邊取線段BC=x以C點為圓心,半徑為2,畫圓,因為有兩解,所以圓應該要與另外一邊相交,如果是沒有解,就是相離,如果有一個解,就是相切.你把圖畫出來之後,就可以明顯看到,C點到另外一邊…
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