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先化標準型x^2/4+y^2/8=1,看出焦點在y軸上,a^2=8,b^2=4,c^2=4,c=2,所以焦距就是2c=4,而焦點座標就是(0,2)(0,-2)了 另一個方法一樣焦點在x軸上了,a^2=4,b^2=3,所以c^2=1,c=1,焦距是2c=2,焦點為(1,0)(-1,0)
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