直线y=2x+5与抛物线y^2=-4x相交于A,B两点,O为坐标原点,求三角形OAB的面积我已经算出AB=根号55,请问OB,OA怎么计算,
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![直线y=2x+5与抛物线y^2=-4x相交于A,B两点,O为坐标原点,求三角形OAB的面积我已经算出AB=根号55,请问OB,OA怎么计算,](/uploads/image/z/8427997-37-7.jpg?t=%E7%9B%B4%E7%BA%BFy%3D2x%2B5%E4%B8%8E%E6%8A%9B%E7%89%A9%E7%BA%BFy%5E2%3D-4x%E7%9B%B8%E4%BA%A4%E4%BA%8EA%2CB%E4%B8%A4%E7%82%B9%2CO%E4%B8%BA%E5%9D%90%E6%A0%87%E5%8E%9F%E7%82%B9%2C%E6%B1%82%E4%B8%89%E8%A7%92%E5%BD%A2OAB%E7%9A%84%E9%9D%A2%E7%A7%AF%E6%88%91%E5%B7%B2%E7%BB%8F%E7%AE%97%E5%87%BAAB%EF%BC%9D%E6%A0%B9%E5%8F%B755%EF%BC%8C%E8%AF%B7%E9%97%AEOB%EF%BC%8COA%E6%80%8E%E4%B9%88%E8%AE%A1%E7%AE%97%EF%BC%8C)
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