1若|a|=|b|,则a=b;2若|a|〉|b|,则a〉b;3若a=b,则a∥b;4若a∥b,则a=b;5若|a|=0,则a=0;6若a=b,则|a|=|b|;
问题描述:
1若|a|=|b|,则a=b;2若|a|〉|b|,则a〉b;3若a=b,则a∥b;4若a∥b,则a=b;5若|a|=0,则a=0;6若a=b,则|a|=|b|;
正确的命题是(3,6).要解析.全点的.
答
1若|a|=|b|,则a=b; 错. 反例: a = 1, b = - 1. 2若|a|〉|b|,则a〉b; 错. 反例: a = -2, b = 1 3若a=b,则a∥b; 对.4若a∥b,则a=b; 错.5若|a|=0,则a=0; 对 .6若a=b,则|a|=|b|; 对.