来自骆政屹的问题
【7769加减乘除算到到24】
7769加减乘除算到到24
1回答
2020-04-27 00:42
【7769加减乘除算到到24】
7769加减乘除算到到24
24点游戏结果大全_百度文库
五.4个中有一对AABC:C(1,9)*C(2,8)=9*8*7/2=252209种有解,43种无解.
无解的有:
1123,1124,1125,1159,1167,1178,1179,1189,2213,2279,3324,3358,4459,4467,5513,5517,5518,5526,5569,5579,6617,6678,7715,7716,7718,7726,7729,7735,7749,7758,7768,7769,7789,8834,8867,9912,9914,9918,9925,9927,9957,9958,997822AB,33AB,44AB,66AB,88AB都仅各有两个无解.11AB,55AB,77AB,99AB分别各有8,6,11,8个无解.