如图,已知抛物线y=-x2+4x+3与y轴交与点A,与x轴正半轴交与点D,顶点为点B,抛物线的对称轴交x轴于点c,M是线y=kx上一个动点,过点M做MN垂直BC并交BC于点N,以MN为边在它的上方做正方形MNPQ,过点Q,A做一
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![如图,已知抛物线y=-x2+4x+3与y轴交与点A,与x轴正半轴交与点D,顶点为点B,抛物线的对称轴交x轴于点c,M是线y=kx上一个动点,过点M做MN垂直BC并交BC于点N,以MN为边在它的上方做正方形MNPQ,过点Q,A做一](/uploads/image/z/2545844-68-4.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%B7%B2%E7%9F%A5%E6%8A%9B%E7%89%A9%E7%BA%BFy%3D-x2%2B4x%2B3%E4%B8%8Ey%E8%BD%B4%E4%BA%A4%E4%B8%8E%E7%82%B9A%2C%E4%B8%8Ex%E8%BD%B4%E6%AD%A3%E5%8D%8A%E8%BD%B4%E4%BA%A4%E4%B8%8E%E7%82%B9D%2C%E9%A1%B6%E7%82%B9%E4%B8%BA%E7%82%B9B%2C%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%9A%84%E5%AF%B9%E7%A7%B0%E8%BD%B4%E4%BA%A4x%E8%BD%B4%E4%BA%8E%E7%82%B9c%2CM%E6%98%AF%E7%BA%BFy%3Dkx%E4%B8%8A%E4%B8%80%E4%B8%AA%E5%8A%A8%E7%82%B9%2C%E8%BF%87%E7%82%B9M%E5%81%9AMN%E5%9E%82%E7%9B%B4BC%E5%B9%B6%E4%BA%A4BC%E4%BA%8E%E7%82%B9N%2C%E4%BB%A5MN%E4%B8%BA%E8%BE%B9%E5%9C%A8%E5%AE%83%E7%9A%84%E4%B8%8A%E6%96%B9%E5%81%9A%E6%AD%A3%E6%96%B9%E5%BD%A2MNPQ%2C%E8%BF%87%E7%82%B9Q%2CA%E5%81%9A%E4%B8%80)
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