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y2=2bx的焦點為(b/2,0),(c+b/2):(c-b/2)=5:3,c/2=b; x^2/a^2+y^2/b^2=1,c^2=a^2-b^2;a^2=(c/2)^2+c^2=5c^2/4; c/a=2√5/5
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