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1 . 已知点eqId451a2d6f08494d60aa3d452d4b6e03fd的坐标满足约束条件eqIda4eb0095ed5c46e4bf06a1c2bb71509deqId4ceda0898c714128b74c1f44fb46ffbe为坐标原点,则eqId8b03500a84d3480792d403c9dba121fe的最小值是(   )
A.1B.eqId5222c2ea3b544c58bafb590c9238c493C.eqId1b23b595b0f545ada384667cdfed94bdD.eqIdcd9b24a6a6e5426ab775be20461174e3
4 . 设xy满足约束条件eqId967eaa5f31a04c23bd709202b104fd5f,则eqId2fe9c282900245c8a3d71f858046c892的取值范围是______
解答题 | 一般(0.65) | 2020·长沙市南雅中学高一月考
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5 . 已知实数对eqId7c63ce5a6ad24145aa17f81bb4a10324满足eqId5502ddf952324abb99fca762582f8e9f
(1)求eqIdc180d4d5cd20420e8319cd8a11d56c96的取值范围;
(2)求eqId702bfbf73d18407f8fb53a646ace883f的取值范围;
(3)求eqId9c92075169a24146b27ad6f4ff2706f9的取值范围.
8 . 已知变量xy满足约束条件eqIdc9895415d9eb439292312d37eb5a3d97若目标函数eqIde137d37948d04cba9cced0d1eb903831的最小值为2,则eqIda1303c81c5ee4ab6a0648e920e3a0578的最小值为(  )
A.2+eqIda2a0ce3781fa4c26b624f5966b7dee44B.5+2eqId807b61b62f09462994e31cf497210538C.8+eqIdea801d789ddc4c2d93a0e7873a20d7bdD.2eqIda2a0ce3781fa4c26b624f5966b7dee44
填空题 | 较易(0.85) | 2021·河南高三月考(文)
9 . 已知实数eqIda9cd3f94eb8045438f75e9daccfa7200eqId072d7d6b911b42bc89207e72515ebf5f满足约束条件eqId767698399b3443d381e208ace8f47f12,则eqId6761a84cf91b4390ba8bc565a3b10ce3的最小值为______.