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只能用積分法做 先求交點 令x^2=8-x^2得x=±2 所以面積是S=∫(-2,2)(8-x^2-x^2)dx=∫(-2,2)(8-2x^2)dx=(8x-2x^3/3)|(-2,2)=(8*2-2*2^3/3)-(8*(-2)-2*(-2)^3/3)=64/3 積分符號不好表達,
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