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二次曲線 - 九州大学(KYUSHU UNIVERSITY)snii/Calculus/02.pdf二次曲線 [定理]二次方程式 ax2 +bxy +cy2 = d の表す図形は、判別式 b2 −4ac が正のとき双曲線(直線)、負のとき楕円(一点、図形を表さ
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