设A、B、C为任意的三个命题公式，试问下面的结论是否正确?若[tex=5.857x1.0]wcFpdOC0Wj+8PA325sUK/WbwPkQ3FMoNy4k54Gak5zN/ItkkAMUWpsKMY/OgmWtr[/tex]，则[tex=3.071x1.0]VSG7MZ0QbKhgI1Ahqpi44aHAiOyYg+7hpHe3xYG/qsw=[/tex]
举一反三
- 设A、B、C为任意的三个命题公式，试问下面的结论是否正确?若[tex=5.857x1.0]xijx/P0tessHO2RLf6TTVWiKzGde05iLwSweoEgh29BXQDGO+vd36CDK4nW7gUzg[/tex]，则[tex=3.071x1.0]VSG7MZ0QbKhgI1Ahqpi44aHAiOyYg+7hpHe3xYG/qsw=[/tex]
- 设A、B、C为任意的三个命题公式，试问下面的结论是否正确?若[tex=7.643x1.0]sZRYiJ9MNokyq3W/a6sx/0l02NO2RW1oBuq3TZio2IMRqUAxDWa8bGptBi5JSPXwWhajQDiKo7pO79bAI7Vqsw==[/tex]，则[tex=3.071x1.0]VSG7MZ0QbKhgI1Ahqpi44aHAiOyYg+7hpHe3xYG/qsw=[/tex]
- 设A、B、C为任意的命题公式，证明：等值关系有对称性：[tex=3.071x1.0]VSG7MZ0QbKhgI1Ahqpi44aHAiOyYg+7hpHe3xYG/qsw=[/tex]，则[tex=3.071x1.0]dVDVQH862RuplpaEQUpbeJcMWUSIxBqSkC22Afv8wSk=[/tex]
- 设A、B、C为任意的命题公式，证明：等值关系有传递性：若[tex=3.071x1.0]8SzjW7Wm4Dd8DCtUhFYMDULL455ulpYybBS/duj0Dvk=[/tex]，且[tex=3.071x1.0]ML3I6Mx9hZq5rBZIjO0+5+PEFxvl3f/gZ2wh0fvnyDw=[/tex]，则[tex=3.071x1.0]8SzjW7Wm4Dd8DCtUhFYMDTHxMGCyUa7ddVsYGzfpVeU=[/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]