初三数学竞赛题1.若实数a、b满足1/2a-ab+b"+2=0.则a的取值范围?(b"是b的二次方)2.如图,在四边形ABCD中,∠B=135°,∠C=120°,AB=2倍根号3,BC=4-2倍根号2,CD=4倍根号2,则AB边长为?3.在一列数X(1)(X的右下
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![初三数学竞赛题1.若实数a、b满足1/2a-ab+b](/uploads/image/z/1719798-6-8.jpg?t=%E5%88%9D%E4%B8%89%E6%95%B0%E5%AD%A6%E7%AB%9E%E8%B5%9B%E9%A2%981.%E8%8B%A5%E5%AE%9E%E6%95%B0a%E3%80%81b%E6%BB%A1%E8%B6%B31%2F2a-ab%2Bb%22%2B2%3D0.%E5%88%99a%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%3F%EF%BC%88b%22%E6%98%AFb%E7%9A%84%E4%BA%8C%E6%AC%A1%E6%96%B9%EF%BC%892.%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E4%B8%AD%2C%E2%88%A0B%3D135%C2%B0%2C%E2%88%A0C%3D120%C2%B0%2CAB%3D2%E5%80%8D%E6%A0%B9%E5%8F%B73%2CBC%3D4-2%E5%80%8D%E6%A0%B9%E5%8F%B72%2CCD%3D4%E5%80%8D%E6%A0%B9%E5%8F%B72%2C%E5%88%99AB%E8%BE%B9%E9%95%BF%E4%B8%BA%3F3.%E5%9C%A8%E4%B8%80%E5%88%97%E6%95%B0X%EF%BC%881%EF%BC%89%EF%BC%88X%E7%9A%84%E5%8F%B3%E4%B8%8B)
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