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题型:解答题 难度系数:0.85 引用次数:369 更新时间:2019/06/18 03:21:50 题号:8239052
类题推荐
【推荐1】如图,在四棱锥eqId43990bf46a194655bfda72dec9aebec1中,底面eqId5ce7a06ae7a34393b92b5277978ac014是边长为2的菱形,eqId30c6eb2fd12d4628bb3c2b3990f33b8b底面eqId5ce7a06ae7a34393b92b5277978ac014eqId34a1d23b592d49c4919f97ee568d3a0ceqId2381423d4cd146cab95f55527681a766eqIdbb9a819299654135a84936d08d832c73的中点,eqId517584fed25c413ba8b7bb33ffa2d5c6eqId0627be51821d4be7b3e024a354815d64的中点,eqId916d433951d945b7baa8e4c578a12dd2
figure
eqId7b0c876472714a72ae295f233fb0622a证明:直线eqId2c222c875f574604b9104797b769af8b平面eqId34f0e9d207644159aa9b36f0da76b115
eqId6a74229c63d7479c8ff55ba05baf9afe求异面直线eqId99a3187c2b8f4bcc9703c74c3b72f1f3eqId39dcb4b610e54ffabde7e9eb32c754cc所成角的余弦值.
难度系数:0.65使用:236次题型:解答题更新:2019/7/12
【推荐2】在四棱锥eqId07faafd63d5b48b9905593298efe8999中,eqId970710ead4884f99958d8b1baf78e704底面ABCD,eqIde6570d2128af48bfba695e4336d32926ABDCeqId21bdfa78e4614dda8fda2bb74c51cb83eqId65f0515fd6764900a8f35e05391167d1,点E为棱PC中点。
(1)证明:eqIde05af97613ba4247957dd1b0ecb4f32e平面PAD;
(2)求直线BE与平面PBD所成角的正弦值;
(3)若F为棱PC上一点,满足eqIdcc54450dbba840c3b26a4e4d4c1275f4,求二面角eqId6faf5cdb424e4202a9e4badba1c9b338的余弦值.figure
难度系数:0.65使用:332次题型:解答题更新:2019/7/3
【推荐3】如图,四棱锥eqIdac097205e9cb41279269aadcac3fb6f1中,eqId6f965927cc194d028e8e531b93021721eqIdeec1827a5d2841888521a9471977822deqIda42996948a984e34986b55ea6a39172aeqIdac63851c7ebb4b4896537d75e772f50deqId62916e2ec8bf449ca728258fad912f49eqId2381423d4cd146cab95f55527681a766eqIdd293923b221045898dcc5442f88aa67a的中点.
figure
(1)求证:eqId4be2d5539d3d4c4a9ea26f92f69454d3
(2)求证:eqIda693f15d88844b1e938f5e17dc99f923平面eqIdfcd3aba6b7804fb68706ce7697ffa7a3
(3)求直线eqId8bf9f946e82248fea882e001e101c571与平面eqId02dc5b9712104a18adc92a366a8c2455所成的角.
难度系数:0.65使用:421次题型:解答题更新:2019/7/4
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