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已知eqIdd0fe7efd7c824d88b7e234c017f03d55,则eqId171bf368c7d74d94adf55f832ba2bc1d______.
更新:2019/6/11难度系数:0.85题型:填空题组卷:178次
更新:2019/7/11难度系数:0.65题型:填空题组卷:266次
下面使用类比推理,得到的结论正确的是(   )
A.直线eqId0ce93bfa1f6a4a23b3258410dd19847a,若eqIdb4de0995c54f41c887e972e40bfe129b,则eqIda5fe91574e254380a678c6a3cc03d027.类比推出:向量eqId79278fbad9394eeb8334c45b2b2c4bfeeqIdb30dbe857af942cda2d347158a291ef4eqId008873c37bf2417e9afa4bc09ddd38f4,若eqId79278fbad9394eeb8334c45b2b2c4bfeeqIdb30dbe857af942cda2d347158a291ef4eqIdb30dbe857af942cda2d347158a291ef4eqId008873c37bf2417e9afa4bc09ddd38f4,则eqId79278fbad9394eeb8334c45b2b2c4bfeeqId008873c37bf2417e9afa4bc09ddd38f4.
B.三角形的面积为eqIdd4d1058fbf1a4590a945d3dedceaa60b,其中eqId70a27b6ddf6b478285353abb3b1f3741eqIdaea992e70d4943e49e893817eb885ed7eqIdad7cefefaba947e1a168bca491c4fca1为三角形的边长,eqIdd9026ce1966847eb86a5e13345fed583为三角形内切圆的半径,类比推出,可得出四面体的体积为eqId063236ab5d0f42afba7e24eea02f5d10,(eqIde0b0a69153d74086acac0f2b28878deceqIdc36de5c6d722440e9911d9802c4068f8eqIdc76fa52010534e50926a7629658fd2b3eqId9cf3535e10f14da398ef323261c4b96a分别为四面体的四个面的面积,eqIdd9026ce1966847eb86a5e13345fed583为四面体内切球的半径)
C.同一平面内,直线eqId0ce93bfa1f6a4a23b3258410dd19847a,若eqId6c187a5b4087410da224aaecbc184ad8,则eqId1e5c1dc58760434b80a688a93ddde74e.类比推出:空间中,直线eqId0ce93bfa1f6a4a23b3258410dd19847a,若eqId6c187a5b4087410da224aaecbc184ad8,则eqId1e5c1dc58760434b80a688a93ddde74e.
D.实数eqId4959a8a13c0b40f3a3b076626a4b616c,若方程eqIdeae7a1da0bf84e3b84ee95b69c3c7870有实数根,则eqId8935c67761374112a697d14db4933b8f.类比推出:复数eqId4959a8a13c0b40f3a3b076626a4b616c,若方程eqIdeae7a1da0bf84e3b84ee95b69c3c7870有实数根,则eqId8935c67761374112a697d14db4933b8f.
更新:2019/7/11难度系数:0.65题型:单选题组卷:26次
满足条件eqId46fc48af515347fbb56eacba3642af00的复数eqId2cd9e2fe3d6540df9399dbefe49ada54在复平面上对应点的轨迹是(    ).
A.椭圆B.两条直线C.圆D.一条直线
更新:2019/7/11难度系数:0.65题型:单选题组卷:62次
eqIda59eb6ab252a4b20b33162614a4325ea为纯虚数,则实数eqId3a4208e0040c42ed8b09de2cae9d562e的值为(  )
A.-2B.2或-3C.3D.-3
更新:2019/7/11难度系数:0.85题型:单选题组卷:93次
更新:2019/7/10难度系数:0.65题型:解答题组卷:334次
设向量eqIdbf80e33f8af0497793eeb1eb2a0e416eeqId26d0383ebc3f44c2984e80b88390a5f5满足eqId2dcb8ee7186e461cb5dbf5ed069432ef,且eqId3da47783fb624107b993b193341d854b.
(1)求eqIdbf80e33f8af0497793eeb1eb2a0e416eeqId26d0383ebc3f44c2984e80b88390a5f5的夹角;
(2)求eqIdd7ede0d5422f40798c922df918aea328的大小.
更新:2019/7/10难度系数:0.65题型:解答题组卷:235次
在平行四边形eqId5ce7a06ae7a34393b92b5277978ac014eqIdefaffb7b2e864bffab30e60ef8781a5e.
figure
(1)用eqId2afa2d9bb3884033b198af61485b188a表示eqId15c713bbc0e0478e98020afea99afa50
(2)若eqId6d0b12338ea94e52a509afd6aafeadf5eqId3907ee008f3842b98683ac85aa0f4e34,求eqId30d32957fc02433abc55fefb13442894的值.
更新:2019/7/10难度系数:0.65题型:解答题组卷:220次
已知eqId0883ef5106544afd9e5714ec75564da4,且eqIdf171165630984b8d8e26e6a1c5e9dbc7,则向量eqIdbf80e33f8af0497793eeb1eb2a0e416e在向量eqId26d0383ebc3f44c2984e80b88390a5f5上的投影等于______
更新:2019/7/10难度系数:0.85题型:填空题组卷:211次
对于函数eqIdc7550d83bbf34186a34894c38b4bd483,给出下列四个结论:①函数eqId4837c94ef0ff4dcf9b1dda4df363275a的最小正周期为eqIdc12500d69e0342b3be4db149b0244a7a;  ②函数eqId4837c94ef0ff4dcf9b1dda4df363275aeqIddd575a0f9fb24bbab2c0c20cf2cbf425上的值域是eqIdff616b1fa6a74129a87edd325df85733;③函数eqId4837c94ef0ff4dcf9b1dda4df363275aeqId3cf0dc5f58444993b87b58f63183e1ff上是减函数; ④函数eqId4837c94ef0ff4dcf9b1dda4df363275a的图象关于点eqId24d36a530729464a9dd2eae32c752591对称.其中正确结论的个数是(  )
A.1B.2C.3D.4
更新:2019/7/10难度系数:0.65题型:单选题组卷:243次
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