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计算椭圆 x^2/9 + y^2/4 = 1 的面积,方法是使用 A = 4integrate from 0 to 3 of (2/3)sqrt(9 - x^2) dx 。
计算椭圆 x^2/9 + y^2/4 = 1 的面积,方法是使用 A = 4integrate from 0 to 3 of (2/3)sqrt(9 - x^2) dx 。
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