按规律填数1/4.3/7.1/2.7/13()()13/22
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按规律填数1/4.3/7.1/2.7/13()()13/22按规律填数1/4.3/7.1/2.7/13()()13/22按规律填数1/4.3/7.1/2.7/13()()13/221/4=1/43/7
按规律填数1/4.3/7.1/2.7/13()()13/22
按规律填数1/4.3/7.1/2.7/13()()13/22
按规律填数1/4.3/7.1/2.7/13()()13/22
1/4=1/4
3/7=3/7
1/2=5/10
7/13=7/13
所以后面是9/17,11/20
最后应该是13/23
9/17,11/20
9/16,11/19,分子加2,分母加3
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