1,7/8,5/8,13/32,( ),19/128
A.17/64;B.15/128;C.15/32;D.1/4
1,1,3,1,3,5,6,( )。
A. 1;B. 2;C. 4;D. 10;
1/3,3/9,2/3,13/21,( )
A.17/27;B.17/26;C.19/27;D.19/28;