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练习十五,27,45,8,38,8,88,90,93,40,45,80,88,90,94,80,89,90,97,33,27,3,30,30,1,31,31,先算7+4=11,再算20+11=31,36,4,40,40,4,44,44,先算6+8=14,再算30+14=44,53,71,40,57,39,75,45,72,31,76,28,91,94,88,97,87,36,75,78,76,20+23=43(个),56+9=65（节）,13,33,14,44,10,60,17,87,23+8=31,67+2=69,5+47=52,25+8=33（只）,20,83,31,85,52,88,81,99,80,81,54,55,41,42,71,26,31,83,37,42,94,18,24,30,36,42,48,24,32,40,48,56,64,35+7=42（只）,=,59,37,70,92,80,90,30+15+10=55,25+20+5=50,6枚,
