已知抛物线y=ax^2+bx-1经过点A(-1,0),B(m,0)(m>0),且与y轴交于点C.(1)求a,b的值(用m表示) (2)⊙O经过A,C三点,求扇形MBC的面积(阴影部分)(用m表示)(3)在x轴上方,若抛物线上存
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![已知抛物线y=ax^2+bx-1经过点A(-1,0),B(m,0)(m>0),且与y轴交于点C.(1)求a,b的值(用m表示) (2)⊙O经过A,C三点,求扇形MBC的面积(阴影部分)(用m表示)(3)在x轴上方,若抛物线上存](/uploads/image/z/7162098-42-8.jpg?t=%E5%B7%B2%E7%9F%A5%E6%8A%9B%E7%89%A9%E7%BA%BFy%3Dax%5E2%2Bbx-1%E7%BB%8F%E8%BF%87%E7%82%B9A%EF%BC%88-1%2C0%EF%BC%89%2CB%EF%BC%88m%2C0%EF%BC%89%EF%BC%88m%3E0%29%2C%E4%B8%94%E4%B8%8Ey%E8%BD%B4%E4%BA%A4%E4%BA%8E%E7%82%B9C.%EF%BC%881%EF%BC%89%E6%B1%82a%2Cb%E7%9A%84%E5%80%BC%EF%BC%88%E7%94%A8m%E8%A1%A8%E7%A4%BA%EF%BC%89+%EF%BC%882%EF%BC%89%E2%8A%99O%E7%BB%8F%E8%BF%87A%EF%BC%8CC%E4%B8%89%E7%82%B9%EF%BC%8C%E6%B1%82%E6%89%87%E5%BD%A2MBC%E7%9A%84%E9%9D%A2%E7%A7%AF%EF%BC%88%E9%98%B4%E5%BD%B1%E9%83%A8%E5%88%86%EF%BC%89%EF%BC%88%E7%94%A8m%E8%A1%A8%E7%A4%BA%EF%BC%89%EF%BC%883%EF%BC%89%E5%9C%A8x%E8%BD%B4%E4%B8%8A%E6%96%B9%EF%BC%8C%E8%8B%A5%E6%8A%9B%E7%89%A9%E7%BA%BF%E4%B8%8A%E5%AD%98)
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