AJUTOR !!! REPEDE !!! DAU COROANĂ !!!

a)0,1(3)=12/90
b)4,1(3)=(413-41)/90
c)0,3(15)=(315-3)/990
d)4,3(15)=(4315-43)/990
e)0,12(15)=(1215-12)/9900
f)3,12(15)=(31215-312)/9900