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8/15һ(8/15һ7/18)

8/15һ(8/15һ7/18) =8/15-8/15+7/18 =7/18

6-7/15-8/18 =6-7/15-4/9 =6-21/45+20/45 =6-41/45 =229/45

23/15-8/15+7/18 23/15-8/15-7/18 15/15-7/18 1-7/18 11/18 ǼӼģǽ⿪ţҵ㷽

=90/15-7/15-4/9=83/15-4/9=249/45-20/45=229/45

23/15-(8/15+7/18) =23/15-8/15-7/18 =1-7/18 =11/18

15.87/18+14.211/18 =15.8+14.2-7/18+11/18 =20-1 =29

6-7/15-8/18 =6-(73/45+8/25/45) =6-(21/45+20/45) =6-41/45 =(645-41)/45 =229/45

ҹ 1,3,7,15,31,63. 8,15,18,13,12,11,22,9.

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