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eqId2f65359250334464951edb78bca50055”是“eqIdb8bb672b651146c1897ebcf908773475”的(   )条件
A.充分不必要B.必要不充分
C.充分必要D.既不充分也不必要
更新:2020/2/21难度:0.85题型:单选题组卷:0
下列函数中,既有奇函数,又在其定义域上单调递增的是(     )
A.eqId17f28a8e1c164f61bfc3c5509ba94a74B.eqId0a8455e041bc47a09370b6fabf0ed1a9
C.eqId830bcccda9ec49aa8674723623c64e48D.eqId9569710e44bd462c9517c7a137dc452d
更新:2020/2/21难度:0.85题型:单选题组卷:0
现计划用两张铁丝网在一片空地上围成一个梯形养鸡场eqId5ce7a06ae7a34393b92b5277978ac014eqId397c03e525444a989afc6269369b5cdbeqIdc19973d3f64445e1a4f72c4766ebae38,已知eqId99a3187c2b8f4bcc9703c74c3b72f1f3eqId0627be51821d4be7b3e024a354815d64两段是由长为eqIda2415067bd4a4ea49238ba88c4c298a1的铁丝网折成,eqIdbf4db7d066034b139ff80a09ab139d45eqIde3de99d6c54049cc9915165f22199e1f两段是由长为eqId1d2c56eba83b463fb2244741bb84c5ef的铁丝网折成.设上底eqId99a3187c2b8f4bcc9703c74c3b72f1f3的长为eqIdbf6ff0eeb77149b1afa03f2bd4217f6e,所围成的梯形面积为eqIde160e1bd76c84648bd8b8fe7a77a17c4.
(1)求S关于x的函数解析式,并求x的取值范围;
(2)当x为何值时,养鸡场的面积最大?最大面积为多少?
更新:2020/2/21难度:0.65题型:解答题组卷:0
已知函数eqIdb85bf6ea651b4ef6bafa6d575784c079eqIde9edd995034840cfb557ea415074294a).
(1)若eqIdd48ac31734084adcaefba79e86e57bb8,讨论eqId4837c94ef0ff4dcf9b1dda4df363275a的单调性;
(2)若eqId4837c94ef0ff4dcf9b1dda4df363275a在区间eqIdd2d791f456914a80af33c93c5cc6ea11内有两个极值点,求实数a的取值范围.
更新:2020/2/21难度:0.4题型:解答题组卷:0
已知eqIdc9a1976ae2ea413fa3ddd9af076ff01d,eqId10798089e05b47d4bb58a4f562d6acf7,则下列等式一定成立的是(    )
A.eqId6710748f35754ef294dd0a675b3a8190B.eqId992f634d4b6b4a5cb3b2e290d253123cC.eqId90eda456b5a44da29ca431b1c9ab7b3fD.eqId729793609f2344a699924efff285bab1
更新:2020/2/21难度:0.94题型:单选题组卷:0
已知eqIdc9a1976ae2ea413fa3ddd9af076ff01d,则“eqId142fb6f8712a4e04a73b56741b7207aa”是“eqId02cd67b4eb1f45a2a43394c8e2cdfa61”的(    )
A.充分而不必要条件B.必要而不充分条件
C.充分必要条件D.既不充分又不必要条件
更新:2020/2/21难度:0.94题型:单选题组卷:0
已知函数eqId39da8430743c403c8988d5c730017796eqIde9edd995034840cfb557ea415074294a.
(1)求函数eqId4837c94ef0ff4dcf9b1dda4df363275a的极值;
(2)当eqIda4c057d1931e4a3387b533879a365e96时,证明:eqIdd4ceaa4a2aa44b2c9ab7228ff72e75de.
更新:2020/2/21难度:0.4题型:解答题组卷:0
已知eqId0aa72756ed0c4c7a89f26aa94f43e47deqIdde963a24921f4ee7a991bf9d4f43a42e是椭圆eqIdf18b5700afd748c9af08fbce0977010b的左、右焦点,过左焦点eqId0aa72756ed0c4c7a89f26aa94f43e47d的直线交椭圆于AB两点,且满足eqIdd6c0108fd7ad429db6ffa7a844c05194,则该椭圆的离心率是________.
更新:2020/2/21难度:0.65题型:填空题组卷:0
已知定点eqIdafba32bd3674457eb13f950741397020,圆eqId862a67282cae4e02affc79f32cd0fdd7,点eqId75a143b898e14ccdb032561fba9da811为圆eqId517584fed25c413ba8b7bb33ffa2d5c6上动点,线段eqId10a7e54dcd3f45feb36c6019ba40d64a的垂直平分线交eqId64f465cc033a42b59a01fed89886efca于点eqIdbedf755e0fdb4d078d6859360706b163,记eqIdbedf755e0fdb4d078d6859360706b163的轨迹为曲线eqId19a4eb16029e4550a14f2afe4741a3c3.
(1)求曲线eqId19a4eb16029e4550a14f2afe4741a3c3的方程;
(2)过点eqId2381423d4cd146cab95f55527681a766eqId517584fed25c413ba8b7bb33ffa2d5c6作平行直线eqId74c7e0292b094e54ae596d37798a05edeqId439fb93f7745417b8bb1747d963c6e60,分别交曲线eqId19a4eb16029e4550a14f2afe4741a3c3于点eqIdcc614bd3390c4d028df189b234dcc351eqId8754ce8cf7f34f04abb9a0c041f57f5c和点eqId0cd8063abf2b458f80091bc51b75a904eqId93cbffaa5ae045d6ac45d1e979991c3a,求四边形eqId3b970dd712b24810ac8d4cfcb34f5fe8面积的最大值.
更新:2020/2/21难度:0.65题型:解答题组卷:0
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