1,C52C42;2,C41C31;3,C41C31+C83+C83;4,C51C43+C52C42+C53C41

分类: 作业答案 • 2021-12-19 16:39:51

问题描述：

1,C52*C42;
2,C41*C31;
3,C41*C31+C83+C83;
4,C51*C43+C52*C42+C53*C41

答

是组合吧~
1,C52*C42=60
2,C41*C31=12
3,C41*C31+C83+C83=124
4,C51*C43+C52*C42+C53*C41=120

1,C52*C42;2,C41*C31;3,C41*C31+C83+C83;4,C51*C43+C52*C42+C53*C41