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](/uploads/image/z/667207-55-7.jpg?t=%E6%8C%89%E8%A7%84%E5%BE%8B%E5%A1%AB%E6%95%B01%2F4.3%2F7.1%2F2.7%2F13%EF%BC%88%EF%BC%89%EF%BC%88%EF%BC%8913%2F22)
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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