数学题、关于圆的.1.若点M、N在圆 x²+y²+kx+2y-4=0上,且点M、N关于直线 x-y+1=0 对称,则该圆的半径是多少?2.若圆 x²+y²+2x-4y+m=0的直径为3,则m的值为_____.3.若直线 3x+4y+m=0与圆x²+y²
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![数学题、关于圆的.1.若点M、N在圆 x²+y²+kx+2y-4=0上,且点M、N关于直线 x-y+1=0 对称,则该圆的半径是多少?2.若圆 x²+y²+2x-4y+m=0的直径为3,则m的值为_____.3.若直线 3x+4y+m=0与圆x²+y²](/uploads/image/z/4341711-39-1.jpg?t=%E6%95%B0%E5%AD%A6%E9%A2%98%E3%80%81%E5%85%B3%E4%BA%8E%E5%9C%86%E7%9A%84.1.%E8%8B%A5%E7%82%B9M%E3%80%81N%E5%9C%A8%E5%9C%86+x%26sup2%3B%2By%26sup2%3B%2Bkx%2B2y-4%3D0%E4%B8%8A%2C%E4%B8%94%E7%82%B9M%E3%80%81N%E5%85%B3%E4%BA%8E%E7%9B%B4%E7%BA%BF+x-y%2B1%3D0+%E5%AF%B9%E7%A7%B0%2C%E5%88%99%E8%AF%A5%E5%9C%86%E7%9A%84%E5%8D%8A%E5%BE%84%E6%98%AF%E5%A4%9A%E5%B0%91%3F2.%E8%8B%A5%E5%9C%86+x%26sup2%3B%2By%26sup2%3B%2B2x-4y%2Bm%3D0%E7%9A%84%E7%9B%B4%E5%BE%84%E4%B8%BA3%2C%E5%88%99m%E7%9A%84%E5%80%BC%E4%B8%BA_____.3.%E8%8B%A5%E7%9B%B4%E7%BA%BF+3x%2B4y%2Bm%3D0%E4%B8%8E%E5%9C%86x%26sup2%3B%2By%26sup2%3B)
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