1)已知集合A,B,命题:A∪B=A是命题:A=B的___条件?必要不充分.为什么?2)A:a=1/8;B:对任意的正数x,2x+a/x>=1.A是B的什么条件?说明理由.
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![1)已知集合A,B,命题:A∪B=A是命题:A=B的___条件?必要不充分.为什么?2)A:a=1/8;B:对任意的正数x,2x+a/x>=1.A是B的什么条件?说明理由.](/uploads/image/z/11444680-64-0.jpg?t=1%EF%BC%89%E5%B7%B2%E7%9F%A5%E9%9B%86%E5%90%88A%2CB%2C%E5%91%BD%E9%A2%98%3AA%E2%88%AAB%3DA%E6%98%AF%E5%91%BD%E9%A2%98%3AA%3DB%E7%9A%84___%E6%9D%A1%E4%BB%B6%3F%E5%BF%85%E8%A6%81%E4%B8%8D%E5%85%85%E5%88%86.%E4%B8%BA%E4%BB%80%E4%B9%88%3F2%EF%BC%89A%EF%BC%9Aa%3D1%2F8%3BB%3A%E5%AF%B9%E4%BB%BB%E6%84%8F%E7%9A%84%E6%AD%A3%E6%95%B0x%2C2x%2Ba%2Fx%26gt%3B%3D1.A%E6%98%AFB%E7%9A%84%E4%BB%80%E4%B9%88%E6%9D%A1%E4%BB%B6%3F%E8%AF%B4%E6%98%8E%E7%90%86%E7%94%B1.)
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