设A={a,b,c},R={,,,}是A上的关系。 计算r(R),s(R),t(R)。
A、t(R)={,,,,,}
B、s(R)={,,,,}
C、s(R)={,,,}
D、r(R)={,,,,,}
E、t(R)={,,,,,,}
F、r(R)={,,,,}
发布时间:2024-05-23 17:13:10
A、t(R)={,,,,,}
B、s(R)={,,,,}
C、s(R)={,,,}
D、r(R)={,,,,,}
E、t(R)={,,,,,,}
F、r(R)={,,,,}