下列命题是否成立?(1) 如果 [tex=0.571x0.786]HXNXn3AXpwdIpZt8+6oCEw==[/tex] 为非零向量, 且 [tex=3.286x1.0]h7cmiE8SP6uy0hwjtDnsumIFAUuopHN3AnGOUVDOOzo=[/tex], 则 [tex=1.643x1.0]q/M0FlKHcUjEvpQqp1DwAg==[/tex];(2) 如果 [tex=0.571x0.786]HXNXn3AXpwdIpZt8+6oCEw==[/tex] 为非零向量, 且 [tex=5.143x1.143]1aV5pT2bemB8SmV+0u1N3wo9pBi8RuqZCVCK9aaJ8BM=[/tex], 则 [tex=1.643x1.0]q/M0FlKHcUjEvpQqp1DwAg==[/tex]
举一反三
- 设[tex=2.429x1.214]if8LlGdz9TZkR2mvx0YYVg==[/tex],试问:若[tex=3.286x1.0]h7cmiE8SP6uy0hwjtDnsumIFAUuopHN3AnGOUVDOOzo=[/tex],能否推出[tex=1.643x1.0]q/M0FlKHcUjEvpQqp1DwAg==[/tex].
- 设 [tex=2.5x1.214]fm3u6mHHN/USSaxljd4pq8DMINCtviGy8O6BRUk4hcY=[/tex].若 [tex=3.286x1.0]h7cmiE8SP6uy0hwjtDnsumIFAUuopHN3AnGOUVDOOzo=[/tex] 且 [tex=5.143x1.143]1aV5pT2bemB8SmV+0u1N3wo9pBi8RuqZCVCK9aaJ8BM=[/tex], 则是否必有 [tex=1.643x1.0]RwnHFD2h3O+/nKJSBjcBgQ==[/tex] ?[br][/br]
- 已知 [tex=6.786x2.714]LZpUJo4fRWScdCm0AksdkbC2Obp9+KzSu9AMkAyvffDXbGabm79MShTsGa0EsBhh[/tex] 为某函数的全微分,则 [tex=0.571x0.786]HXNXn3AXpwdIpZt8+6oCEw==[/tex] 等于 A: -1 B: 0 C: 1 D: 2
- 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 。
- 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]