设[tex=4.286x1.143]7VMcpSbW/vhHoPGSizMdMw==[/tex],[tex=2.429x1.357]TvI1/GNGHdkXdIBlL7PGfQ==[/tex],[tex=2.286x1.357]qNMzF8uNPlTvJS5TvA5NpQ==[/tex],[tex=2.286x1.357]vz0Ua3UencmDwQ8dH1Letg==[/tex], 求 [tex=6.571x1.143]Gngwem74f+LyI2DLn/Z84nA1j6SdqdHBawJG5/YEcS2Bk+MJ5A9QkXr+MCs6oqPb[/tex].
举一反三
- 设二元关系[tex=14.5x1.357]nWKfumG3X+P6w5DlualfqW9XDw6gDTNxW+uTplqfI/x/OgHpgOK3lVLpVzdI3yhj[/tex],试求 [tex=2.429x1.357]VpxpuJ/p+FjXGa+AnkH98A==[/tex]与[tex=2.286x1.357]2EkdX8/PuVShcU6F4+x0xg==[/tex]
- 设[tex=0.571x0.786]7G1MINzwputr5mgALyjQfA==[/tex],[tex=0.429x1.0]MFNb9O03Kg08NVHdCr/E1A==[/tex]两个向量满足[tex=2.429x1.357]TvI1/GNGHdkXdIBlL7PGfQ==[/tex],[tex=2.286x1.357]qNMzF8uNPlTvJS5TvA5NpQ==[/tex],[tex=4.714x2.143]2eP846PAShYEbNG9wLtxcL3KGaP6CHjgYI6gRiJ/+dc=[/tex],试求[tex=3.214x1.143]Sz9wT02dwie4dmV0OJeoqA==[/tex]与[tex=2.786x1.143]7TWTBj66z/RFBTP1ZnyqOg==[/tex]两个向量之间的夹角.
- 6个顶点11条边的所有非同构的连通的简单非平面图有[tex=2.143x2.429]iP+B62/T05A6ZTM0eeaWiQ==[/tex]个,其中有[tex=2.143x2.429]ndZSw3zT0QTOVLVdoUto1Q==[/tex]个含子图[tex=1.786x1.286]J+vVZa2YaMpc6mJBbqVvWw==[/tex],有[tex=2.143x2.429]lmhx48evnQMhi03NovPXig==[/tex]个含与[tex=1.214x1.214]kFXZ1uR8GjycbJx+Ts2kyQ==[/tex]同胚的子图。供选择的答案[tex=3.071x1.214]3KinXFh3SXhZ7nIe1y9KEV6aadxhhJWeEy6Dij1iObdMUZkY6ZA5J2dVVjPSuhEf[/tex]:(1) 1 ;(2) 2 ;(3) 3 ; (4) 4 ;(5) 5 ;(6) 6 ; (7) 7 ; (8) 8 。
- 设向量[tex=0.571x0.786]HXNXn3AXpwdIpZt8+6oCEw==[/tex]与向量[tex=0.429x1.0]Q2fWySASH/4Xf2eu85OwAQ==[/tex]垂直,向量[tex=0.5x0.786]hycNLgozeED/VkKdun7zdA==[/tex]与[tex=0.571x0.786]HXNXn3AXpwdIpZt8+6oCEw==[/tex],[tex=0.429x1.0]Q2fWySASH/4Xf2eu85OwAQ==[/tex]两个向量的夹角都是[tex=1.429x1.071]s3z0Yb1ACTgHO2Vzw1/XRw==[/tex],并且[tex=2.429x1.357]duSjz5c/A7Rh2xAM5F0QdA==[/tex],[tex=2.286x1.357]qNMzF8uNPlTvJS5TvA5NpQ==[/tex],[tex=2.286x1.357]dclYQI2YhQOEn8E4AdvlTg==[/tex],计算:(1)[tex=2.786x1.357]2mYjRUS9hnjorh1t4drr6w==[/tex].(2)[tex=7.214x1.357]N3eY2YxxfgfUUkE9sAzQhwM4iVAZE25GDq0+Rc9cuQA=[/tex].(3)[tex=8.214x1.5]Ts9UJCofCe0XJM70+ZAys5PFnXcR73dnXziJIPscUwfMXPV4iXrmUQsd7rTkIjgW[/tex].
- 判断下列命题是否为真:(1)[tex=3.643x1.357]/5abqJjwKZ1qr+6hsVFF5EBvfq3ggOFNlHMClz0h9nk=[/tex](2)[tex=2.929x1.357]rGJpyjIjJpbcoBTWxP0Jiw==[/tex](3)[tex=4.5x1.357]2wycHMoqU83MyEp17iBils58bR7YLuCTI2G9NVAdlfY=[/tex](4)[tex=5.214x1.357]CTz2gu+IIm1GgNmYMGaduCRtA41wnW4WqwRWwEhq6aA=[/tex](5)[tex=4.857x1.357]1DcE2BMMOaZhTuxR/mjgsboXxfg5ET59Dp4I/jjEDuw=[/tex](6)[tex=4.643x1.357]BSryrsQYOvTP2hTWRu6t4nAuJwlSs4L9jaq70EpB+Us=[/tex](7)若[tex=6.0x1.357]y0IZLUnBO88nR8WBZYvd7QXv5S1OMINV5cQNzPyiyAc=[/tex],则[tex=3.429x1.357]1brfPwTkVVIX4GfoMIUskA==[/tex](8)若[tex=7.643x1.357]MhLfJXZnhbXiB0x3oNtFzThV4Y1mJxe1VYr7PkJE/T6hmTD3WWp+UxbNwvUQ6DHk[/tex],则[tex=4.143x1.357]LZUA94ISo1po5HWsOVeBCjo0rMvj7uw3bGw5HiZenrI=[/tex]