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练习十九,59,79,77,95,63,84,55,53,37,55,48,66,74,88,9,76,4+4+4+4=16(人),40,86,45,22,39,64,33,37,66,77,38,58,43,79,31,8,74,59,59,85,96-4=92（本）,28,68,54,67,65,63,72,25,30,18,-4,14,-4,10,-4,6,-4,2,4个,56-50=6（下）,38,75,34,0,60,12+9=21（张）,22,15,45,36,16,20,24,-8,16,-8,8,-8,0,3次,7,66,0,0,
