1.19,4,18,3,16,1,17,( 5 4 3 22.3/5,3/5,2/3,3/4,( 17/20 19/20 21/25 23/253.9,32,75,144,( 232 238 240 245

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1.19,4,18,3,16,1,17,( 5 4 3 22.3/5,3/5,2/3,3/4,( 17/20 19/20 21/25 23/253.9,32,75,144,( 232 238 240 245

1.19,4,18,3,16,1,17,( 5 4 3 22.3/5,3/5,2/3,3/4,( 17/20 19/20 21/25 23/253.9,32,75,144,( 232 238 240 245
1.19,4,18,3,16,1,17,( 5 4 3 22.3/5,3/5,2/3,3/4,( 17/20 19/20 21/25 23/253.9,32,75,144,( 232 238 240 245

1.19,4,18,3,16,1,17,( 5 4 3 22.3/5,3/5,2/3,3/4,( 17/20 19/20 21/25 23/253.9,32,75,144,( 232 238 240 245
1.19,4,18,3,16,1,17,( 5 4 3 (19,4),(18,3),(16,1),(17,( )两数差都是15,所以17-15=2.2.3/5,3/5,2/3,3/4,( 17/20 19/20 21/25 23/25选21/25化为:3/5,6/10,10/15,15/20分子分母都构成:3,6,10,15;5,10,15,20所以分子相减构成等差:3,4,5,6,(公差1);分母构成等差(公差5).所以为21/253.9,32,75,144,( 232 238 240 245选2459,32,75,144,( 两数差是23,43,69,再两数差是20,26,32(等差,公差6所以,69+32=101,144+101=145"