如图,经过点A(0,-4)的抛物线y=1/2x²+bx+c与x轴相交于点B(-2,0)和C,O为坐标原点 若点M在y轴上 且∠OMB+∠OAB=∠ACB 求AM的长
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![如图,经过点A(0,-4)的抛物线y=1/2x²+bx+c与x轴相交于点B(-2,0)和C,O为坐标原点 若点M在y轴上 且∠OMB+∠OAB=∠ACB 求AM的长](/uploads/image/z/805210-34-0.jpg?t=%E5%A6%82%E5%9B%BE%2C%E7%BB%8F%E8%BF%87%E7%82%B9A%280%2C-4%29%E7%9A%84%E6%8A%9B%E7%89%A9%E7%BA%BFy%3D1%2F2x%26%23178%3B%2Bbx%2Bc%E4%B8%8Ex%E8%BD%B4%E7%9B%B8%E4%BA%A4%E4%BA%8E%E7%82%B9B%28-2%2C0%29%E5%92%8CC%2CO%E4%B8%BA%E5%9D%90%E6%A0%87%E5%8E%9F%E7%82%B9+%E8%8B%A5%E7%82%B9M%E5%9C%A8y%E8%BD%B4%E4%B8%8A+%E4%B8%94%E2%88%A0OMB%2B%E2%88%A0OAB%3D%E2%88%A0ACB+%E6%B1%82AM%E7%9A%84%E9%95%BF)
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