1.一块边长为a的正方形桌布,平铺在直径为b(a>b)的圆桌上,若桌布四角下垂的最大长度相等,则最大长度为()2.设直线y=kx与双曲线y=-5/x相交于A(x1,y1)B(x2,y2)两点,则x1y2+x2y1的值是3.如图,三角形ABC
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![1.一块边长为a的正方形桌布,平铺在直径为b(a>b)的圆桌上,若桌布四角下垂的最大长度相等,则最大长度为()2.设直线y=kx与双曲线y=-5/x相交于A(x1,y1)B(x2,y2)两点,则x1y2+x2y1的值是3.如图,三角形ABC](/uploads/image/z/2481398-62-8.jpg?t=1.%E4%B8%80%E5%9D%97%E8%BE%B9%E9%95%BF%E4%B8%BAa%E7%9A%84%E6%AD%A3%E6%96%B9%E5%BD%A2%E6%A1%8C%E5%B8%83%2C%E5%B9%B3%E9%93%BA%E5%9C%A8%E7%9B%B4%E5%BE%84%E4%B8%BAb%28a%3Eb%29%E7%9A%84%E5%9C%86%E6%A1%8C%E4%B8%8A%2C%E8%8B%A5%E6%A1%8C%E5%B8%83%E5%9B%9B%E8%A7%92%E4%B8%8B%E5%9E%82%E7%9A%84%E6%9C%80%E5%A4%A7%E9%95%BF%E5%BA%A6%E7%9B%B8%E7%AD%89%2C%E5%88%99%E6%9C%80%E5%A4%A7%E9%95%BF%E5%BA%A6%E4%B8%BA%EF%BC%88%EF%BC%892.%E8%AE%BE%E7%9B%B4%E7%BA%BFy%3Dkx%E4%B8%8E%E5%8F%8C%E6%9B%B2%E7%BA%BFy%3D-5%2Fx%E7%9B%B8%E4%BA%A4%E4%BA%8EA%28x1%2Cy1%29B%28x2%2Cy2%29%E4%B8%A4%E7%82%B9%2C%E5%88%99x1y2%2Bx2y1%E7%9A%84%E5%80%BC%E6%98%AF3.%E5%A6%82%E5%9B%BE%2C%E4%B8%89%E8%A7%92%E5%BD%A2ABC)
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