1/3 3/9 2/3 13/21 ( ) A.17/27 B.17/26 c.19/27 D.19/28

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1/33/92/313/21()A.17/27B.17/26c.19/27D.19/281/33/92/313/21()A.17/27B.17/26c.19/27D.19/281/33/92/313/

1/3 3/9 2/3 13/21 ( ) A.17/27 B.17/26 c.19/27 D.19/28
1/3 3/9 2/3 13/21 ( ) A.17/27 B.17/26 c.19/27 D.19/28

1/3 3/9 2/3 13/21 ( ) A.17/27 B.17/26 c.19/27 D.19/28
17/27.1/3 3/9 2/3(10/15) 13/21
分母以6递增,相邻分子之差分别为2,7,3,8,那下面之差应该为4和9
所以13+4=17