Then A 1(u, 0, uuK), E( 1, 1 0), P(0, 0, uuk), B 1(0, u, 0), C(-u, 0).
(I) from the above formula, A 1E=(- 1,-1, uuk), BC=(-u, -u, 0).
PB=(0, u, -u has been praised and stepped on. What's your comment on this answer? Put away comments//high quality or satisfaction or special types or recommended answers dottimewindow.iperformance & window.iperformance.mark ('c _ best',+newdate); Lawyer recommendation service: If your problem has not been solved, please describe your problem in detail and provide free professional consultation through Baidu Law Professional Edition. Other similar problems 20 13- 12-04 are as shown in the figure. The bottom of the quadrangular prism ABCD-a1b1c1d1is square, and O is the bottom. A 1O⊥ plane ABCD, AB=AA 1= radical number 2.132016-12-02, in cube ABCD-a1b/. It is proved that in D 1, E, F, B*** plane 2220 12-05-0 1, the cube ABCD-A1b1d/is known. The verification is in BF ∨ = ed1242016-12-01cubic ABCD-a1b1d/kloc. In 752011-04-21cube ABCD-A 1b 1 c1d1,M.N are edges a/kloc-0, respectively. Verification: In EFDB's four-point * * plane 72011-04-21cube ABCD-A1b1c1kloc-0/,m Verification: In the known cube ABCD-A1B1D1D1,points E and F are the midpoints of sides AA 1 and CC 1 respectively. It is proved that BF ∨ = ed12022-06-18 is a known regular quadrangular prism ABCD-a1b1c1d1,where aa/kloc-0. Recommended for you: F.context('cmsRight', [{'URL':'/d 01373f082025aaf51kloc-0/aa256e9edab64034f1a07? x-BCE-process = image % 2f resize % 2Cm _ lfit % 2Cw _ 450% 2Ch _ 600% 2c limit _ 1% 2f quality % 2Cq _ 85% 2f format % 2Cf _ auto '，' contractId':'A24KA00562 '，}，{ ' URL ':/s？ word = % E6 % AC % A7 % E6 % B4 % B2 % E6 % 9D % AF & sa = searchpromo _ ozb _ zhidao _ tuijian '，' src ':'/3 BF 33 a 87 e 950352 AAF 5 df 4954 143 fbf2b 2 1 18 b6b？ x-BCE-process = image % 2f resize % 2Cm _ lfit % 2Cw _ 450% 2Ch _ 600% 2c limit _ 1% 2f quality % 2Cq _ 85% 2f format % 2Cf _ auto '，' contractId ':' '，}])； The price of electric cars has dropped many times. Is the quality guaranteed? What impact will the "network toilet" have? Is Huaqiang North's second-hand mobile phone reliable? Why is the cost of cancer treatment getting higher and higher? I recommend f.context ('recbrand', [{"img": "\/86D6277F9E2F07083523F69DFB 24B 899A901F20d? x-BCE-process = image % 2f resize % 2Cm _ lfit % 2Cw _ 450% 2Ch _ 600% 2c limit _ 1% 2f quality % 2Cq _ 85% 2f format % 2Cf _ auto "，" url":"/hm.js？ 6859 ce 5a af 00 FB 00387 e 6434 E4 FCC 925 "； var s = document . getelementsbytagname(" script ")[0]； s.parentNode.insertBefore(hm，s)； })(); window . TT = 17 19985989；