题1.已知∠A不是△ABC的最大内角,且20cos^2 *2/A =3(cot4/A- tan4/A),AB*CA=-8(负八)求变长BC的最小值.题2.设集合A={X||X-a|<2},B={X|X+2分之2X-1<1},若A包含B,求实数a的取值范围.题3.设△ABC的内角A
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![题1.已知∠A不是△ABC的最大内角,且20cos^2 *2/A =3(cot4/A- tan4/A),AB*CA=-8(负八)求变长BC的最小值.题2.设集合A={X||X-a|<2},B={X|X+2分之2X-1<1},若A包含B,求实数a的取值范围.题3.设△ABC的内角A](/uploads/image/z/5528819-11-9.jpg?t=%E9%A2%981.%E5%B7%B2%E7%9F%A5%E2%88%A0A%E4%B8%8D%E6%98%AF%E2%96%B3ABC%E7%9A%84%E6%9C%80%E5%A4%A7%E5%86%85%E8%A7%92%2C%E4%B8%9420cos%EF%BC%BE2+%2A2%2FA+%3D3%EF%BC%88cot4%2FA-+tan4%2FA%29%2CAB%2ACA%3D-8%EF%BC%88%E8%B4%9F%E5%85%AB%EF%BC%89%E6%B1%82%E5%8F%98%E9%95%BFBC%E7%9A%84%E6%9C%80%E5%B0%8F%E5%80%BC.%E9%A2%982.%E8%AE%BE%E9%9B%86%E5%90%88A%3D%EF%BD%9BX%7C%7CX-a%7C%EF%BC%9C2%EF%BD%9D%2CB%3D%EF%BD%9BX%7CX%2B2%E5%88%86%E4%B9%8B2X-1%EF%BC%9C1%EF%BD%9D%2C%E8%8B%A5A%E5%8C%85%E5%90%ABB%2C%E6%B1%82%E5%AE%9E%E6%95%B0a%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4.%E9%A2%983.%E8%AE%BE%E2%96%B3ABC%E7%9A%84%E5%86%85%E8%A7%92A)
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