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否命題 若x≠2,則x平方-5 x+6≠0 逆命題 若x平方-5 x+6=0,則x=2 因為x=3,x平方-5 x+6=0 所以這兩個都是假命題 逆否命題 若x平方-5 x+6≠0,則x≠2 因為原命題為真,所以逆否命題是真命題
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