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椭圆 4x^2 + 9y^2 = 36 ——顶点？（答： (+/- 3, 0), (0, +/- 2) 。）
椭圆 4x^2 + 9y^2 = 36 ——顶点？（答： (+/- 3, 0), (0, +/- 2) 。）
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