1.已知△ABC的三边a,b,c满足a²+b²+c²-ab-bc-ac=0,试判断△ABC的形状.2.已知:a,b满足a²+2b²-2ab-1=0,求a+2b的值.3.已知2x²-x²-13x+k能在有理数范围内分解因式,且有一个因式为2x+1,求
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![1.已知△ABC的三边a,b,c满足a²+b²+c²-ab-bc-ac=0,试判断△ABC的形状.2.已知:a,b满足a²+2b²-2ab-1=0,求a+2b的值.3.已知2x²-x²-13x+k能在有理数范围内分解因式,且有一个因式为2x+1,求](/uploads/image/z/14911677-45-7.jpg?t=1.%E5%B7%B2%E7%9F%A5%E2%96%B3ABC%E7%9A%84%E4%B8%89%E8%BE%B9a%2Cb%2Cc%E6%BB%A1%E8%B6%B3a%26sup2%3B%2Bb%26sup2%3B%2Bc%26sup2%3B-ab-bc-ac%3D0%2C%E8%AF%95%E5%88%A4%E6%96%AD%E2%96%B3ABC%E7%9A%84%E5%BD%A2%E7%8A%B6.2.%E5%B7%B2%E7%9F%A5%EF%BC%9Aa%2Cb%E6%BB%A1%E8%B6%B3a%26sup2%3B%2B2b%26sup2%3B-2ab-1%3D0%2C%E6%B1%82a%2B2b%E7%9A%84%E5%80%BC.3.%E5%B7%B2%E7%9F%A52x%26sup2%3B-x%26sup2%3B-13x%2Bk%E8%83%BD%E5%9C%A8%E6%9C%89%E7%90%86%E6%95%B0%E8%8C%83%E5%9B%B4%E5%86%85%E5%88%86%E8%A7%A3%E5%9B%A0%E5%BC%8F%2C%E4%B8%94%E6%9C%89%E4%B8%80%E4%B8%AA%E5%9B%A0%E5%BC%8F%E4%B8%BA2x%2B1%2C%E6%B1%82)
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