va roog ex 5 si 6 repede!

5. (100a+10b+10a+b)/(10a+b+10b+a)=(110a+11b)/(11a+11b)=11(10a+b)/(11*(a+b))=(10a+b)/(a+b)
6.a) x∈{1,3,7,9}
b) = (4*5+2)/5 + (5*1+1)/5 = 22/5 + 6/5 = 28/5