初三数学:已知平行四边形ABCD的两边AB,AD的长是关于x的方程x²-mx+m/2-1/4的两个实数根(1)当m为何值时,是四边形ABCD是菱形?求出这时菱形的边长.(2)若AB的长为2,那么平行四边形ABCD的周长
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![初三数学:已知平行四边形ABCD的两边AB,AD的长是关于x的方程x²-mx+m/2-1/4的两个实数根(1)当m为何值时,是四边形ABCD是菱形?求出这时菱形的边长.(2)若AB的长为2,那么平行四边形ABCD的周长](/uploads/image/z/2539974-30-4.jpg?t=%E5%88%9D%E4%B8%89%E6%95%B0%E5%AD%A6%EF%BC%9A%E5%B7%B2%E7%9F%A5%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E7%9A%84%E4%B8%A4%E8%BE%B9AB%2CAD%E7%9A%84%E9%95%BF%E6%98%AF%E5%85%B3%E4%BA%8Ex%E7%9A%84%E6%96%B9%E7%A8%8Bx%26%23178%3B%EF%BC%8Dmx%2Bm%2F2-1%2F4%E7%9A%84%E4%B8%A4%E4%B8%AA%E5%AE%9E%E6%95%B0%E6%A0%B9%281%29%E5%BD%93m%E4%B8%BA%E4%BD%95%E5%80%BC%E6%97%B6%2C%E6%98%AF%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E6%98%AF%E8%8F%B1%E5%BD%A2%3F%E6%B1%82%E5%87%BA%E8%BF%99%E6%97%B6%E8%8F%B1%E5%BD%A2%E7%9A%84%E8%BE%B9%E9%95%BF.%EF%BC%882%EF%BC%89%E8%8B%A5AB%E7%9A%84%E9%95%BF%E4%B8%BA2%2C%E9%82%A3%E4%B9%88%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E7%9A%84%E5%91%A8%E9%95%BF)
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