133/57,119/51,91/39,49/21,( ),7/3 A.28/12 B.21/14 C.28/9 D.31/15
问题描述:
133/57,119/51,91/39,49/21,( ),7/3 A.28/12 B.21/14 C.28/9 D.31/15
答
[这个题选C ,各项化简后都是7/3
133/57,119/51,91/39,49/21,( ),7/3 A.28/12 B.21/14 C.28/9 D.31/15
[这个题选C ,各项化简后都是7/3