推 s25g5d4:答案有沒有錯阿... 04/24 17:52
→ stupidroach:第一題 第二題 答案倒過來了吧@@? 04/24 17:53
→ kdiou:第一題我用數的算的都是30- - 04/24 17:53
→ stupidroach:第一題C5取1*3! 5*6=30 04/24 17:54
→ stupidroach:第2題 [6!/3!]*2! = 5!*2!=240 04/24 17:54
→ stupidroach:第三題 2^5-C5取0 C5取1 04/24 18:00
→ stupidroach:或者C5取2+C5取3+C5取4+C5取5 = 26 04/24 18:00
→ stupidroach:第4題 C5取3*C8取7+C5取4*C8取6+C5取5*C8取5=276 04/24 18:09
→ stupidroach:7!/3!*2!=420 04/24 18:10
→ stupidroach:那是第五題 04/24 18:10
推 s25g5d4:樓上可以考慮回個文... 04/24 18:15
→ khiuyds:sorry 答案相反 04/24 18:16