Discrete Mathematics -Relations?

[aznxbabi88]

On the set of real numbers:

R1={(a,b)R² | a>b}, the "greater than" relation,
R2={(a,b)R² | ab}, the "greater than or equal to" relation,
R3={(a,b)R² | a<b}, the "less than" relation,
R4={(a,b)R² | ab}, the "less than or equal to" relation,
R5={(a,b)R² | a=b}, the "equal to" relation,
R6={(a,b)R² | ab}, the "unequal to" relation

Find:
a)R1R3 , b)R1R5 , c)R2R4 , d)R3R5 , e)R1 - R1 ,
f)R2 - R1 , g)R1R3 , h)R2R4

a,c,e,g is sufficient I just need a general idea on how to compute these. Thanks.
in this problem means the symmetric difference: