Question

设集合S={A0,A1,A2,A3},在S上定义运算

Answer 1

当x=A0时,（x♁x）♁A2=（A0♁A0）♁A2=A0♁A2=A2≠A0

当x=A1时,（x♁x）♁A2=（A1♁A1）♁A2=A2♁A2=A4=A0

当x=A2时,（x♁x）♁A2=（A2♁A2）♁A2=A0♁A2=A2≠A0

当x=A3时,（x♁x）♁A2=（A3♁A3）♁A2=A2♁A2=A0=A0

则满足关系式（x♁x）♁A2=A0的x（x∈S）的个数为：2个．