与命题“若a∈M则b∉M”的等价的命题是( )A、若a∉M,则b∉M B、若b∉M,则a∈M C、若a∉M,则b∈M D、若b∈M,则a∉M
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![与命题“若a∈M则b∉M”的等价的命题是( )A、若a∉M,则b∉M B、若b∉M,则a∈M C、若a∉M,则b∈M D、若b∈M,则a∉M](/uploads/image/z/10291344-24-4.jpg?t=%E4%B8%8E%E5%91%BD%E9%A2%98%E2%80%9C%E8%8B%A5a%E2%88%88M%E5%88%99b%26%238713%3BM%E2%80%9D%E7%9A%84%E7%AD%89%E4%BB%B7%E7%9A%84%E5%91%BD%E9%A2%98%E6%98%AF%EF%BC%88%E3%80%80%E3%80%80%EF%BC%89A%E3%80%81%E8%8B%A5a%26%238713%3BM%2C%E5%88%99b%26%238713%3BM+B%E3%80%81%E8%8B%A5b%26%238713%3BM%2C%E5%88%99a%E2%88%88M+C%E3%80%81%E8%8B%A5a%26%238713%3BM%2C%E5%88%99b%E2%88%88M+D%E3%80%81%E8%8B%A5b%E2%88%88M%2C%E5%88%99a%26%238713%3BM)
与命题“若a∈M则b∉M”的等价的命题是( )A、若a∉M,则b∉M B、若b∉M,则a∈M C、若a∉M,则b∈M D、若b∈M,则a∉M
与命题“若a∈M则b∉M”的等价的命题是( )
A、若a∉M,则b∉M B、若b∉M,则a∈M
C、若a∉M,则b∈M D、若b∈M,则a∉M
与命题“若a∈M则b∉M”的等价的命题是( )A、若a∉M,则b∉M B、若b∉M,则a∈M C、若a∉M,则b∈M D、若b∈M,则a∉M
原命题与逆否命题等价
命题“若a∈M则b∉M”的逆否命题是“若b∈M,则a∉M”
选D
设a,b∈R,若a+b=<=0,则a<=0或b<=0