大学离散数学题，快考试了求大神帮忙

r(R)=RU1x={,,,,}s(R)=RUR(逆)={,,,,} s(R)=R(1阶)UR(2阶)UR=(3阶)…{,,,,} R（1阶）={,，} R（2阶）={,，} R(3阶)={,,} R(4阶={,，} 故:SR={,，，,,,,}