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X2+Y2-6X+4Y+12=0, (x-3)²+(y+2)²=1²圓心是(3,-2),半徑是1 X2+Y2-14X-2Y+14=0 (x-7)²+(y-1)²=6²圓心是(7,1),半徑是6 圓心距為5, 所以兩圓內切!
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