已知抛物线y=-1/2X的平方+3X-5/2,顶点为C,与x轴交于点A、B(A在B左边),对称轴与x轴交于点D,(接上)将∠DCB绕点C按顺时针方向旋转,角的两边CD和CB与x轴分别交于点P、Q,设旋转角为α(0°
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![已知抛物线y=-1/2X的平方+3X-5/2,顶点为C,与x轴交于点A、B(A在B左边),对称轴与x轴交于点D,(接上)将∠DCB绕点C按顺时针方向旋转,角的两边CD和CB与x轴分别交于点P、Q,设旋转角为α(0°](/uploads/image/z/1671602-50-2.jpg?t=%E5%B7%B2%E7%9F%A5%E6%8A%9B%E7%89%A9%E7%BA%BFy%3D-1%2F2X%E7%9A%84%E5%B9%B3%E6%96%B9%2B3X-5%2F2%2C%E9%A1%B6%E7%82%B9%E4%B8%BAC%2C%E4%B8%8Ex%E8%BD%B4%E4%BA%A4%E4%BA%8E%E7%82%B9A%E3%80%81B%EF%BC%88A%E5%9C%A8B%E5%B7%A6%E8%BE%B9%EF%BC%89%2C%E5%AF%B9%E7%A7%B0%E8%BD%B4%E4%B8%8Ex%E8%BD%B4%E4%BA%A4%E4%BA%8E%E7%82%B9D%2C%EF%BC%88%E6%8E%A5%E4%B8%8A%EF%BC%89%E5%B0%86%E2%88%A0DCB%E7%BB%95%E7%82%B9C%E6%8C%89%E9%A1%BA%E6%97%B6%E9%92%88%E6%96%B9%E5%90%91%E6%97%8B%E8%BD%AC%2C%E8%A7%92%E7%9A%84%E4%B8%A4%E8%BE%B9CD%E5%92%8CCB%E4%B8%8Ex%E8%BD%B4%E5%88%86%E5%88%AB%E4%BA%A4%E4%BA%8E%E7%82%B9P%E3%80%81Q%2C%E8%AE%BE%E6%97%8B%E8%BD%AC%E8%A7%92%E4%B8%BA%CE%B1%EF%BC%880%C2%B0)
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