3,4,2,6,-2,()
A.13 B.-13 C.14 D.-14
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4/17,7/13, 10/9, () A.13/6;B.13/5;C.14/5;D.7/3;
3,4,2,6,-2,() A.13 B.-13 C.14 D.-14
4/17,7/13,10/9,()。 A.13/6 B.13/5 C.14/5 D.7/3
2,3,4,6,8,9,10,12,()。A.13B.14C.16D.18
6 4 5 3 2 ()。A.1 B.6 C.14 D.8
2 3 4 6 8 9 10 12 ()。A.13 B.14 C.16 D.18