• 2022-07-23
    给定的集合和该集合上的二元运算,指出该运算的性质,并求出它的么元,零元和所有可逆元素的逆元。(3)[tex=4.214x1.214]CnkrPpWZtTOQGG1GbElZrg==[/tex],[tex=0.857x1.214]ChdusW5rAupjge6v/DGHRA==[/tex]为有理数集,[tex=17.214x1.357]sSfKlp1LrWksKh+ZllRJK/8+X+wQjxFrpCIt0VmVsOH1BZE/T4urSL7cBP3eQCjvk8yBH+aPWMXCkNZ/PZy3B43/kDK0+wpVR+EAfxsb5iyC3oLbTk0B8fPha48AWxzffkXhJK5B0Dr210kd2sWQIqEfw59rBuDEBUGJZ8WatP0=[/tex]