Mathematics
Senior High
Solved
為什麼不能像鉛筆那樣寫？
求解謝謝
由7個數字0,0,1,1,3,3,3排成的七位數中,奇數有多少個?
解
133
1.3
51=120
120×4=480#
3
個位為1:至一口首
100
6!
=
3!
40 11
6!
57
列題3 有限制順序 視為口
212121
2121
=
【常考題】
60
40+60=1001
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