1 5 7 10 13 15 a 19,20 b 19 25 c 17 25 d 17 20 求详解

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157101315a19,20b1925c1725d1720求详解157101315a19,20b1925c1725d1720求详解157101315a19,20b1925c1725d1720求详解选

1 5 7 10 13 15 a 19,20 b 19 25 c 17 25 d 17 20 求详解
1 5 7 10 13 15 a 19,20 b 19 25 c 17 25 d 17 20 求详解

1 5 7 10 13 15 a 19,20 b 19 25 c 17 25 d 17 20 求详解
选a
5-1=4
10-7=3
15-13=2
所以下两项,后项-前项=1
只有a满足,20-19=1

a=17
b=17
c=17
d=17

两个两个一组
1 5
7 10
13 15
分别相差4、3、2
所以后一组应该相差1
即19、20

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