英文数学题求救,分数类的!
Afindthedecimalexpamsionfor1/43
Bshowthat9isafactorofthesumofthedigitsintherepetendof1/7.1/39,1/43
Csupposenoneof2,3,5isafactorofn.Explainwhy9isafactorofthesumofthedigitsintherepetendintherepetendof1/n
DFindthefourthsmallestvalueofnwhichneither2nor5isafactorand9isnotafactorofthesumofthedigitsintherepetendof1/n
求C和