✔ 最佳答案
9a)
P(兩骰點數總和為 1) = 0
b)4
= 1 + 3 = 2 + 2 = 3 + 1P(兩骰點數總和為 4) = 3/(6x6) = 1/12
c)P(兩骰點數總和為 14) = 0
d)10
= 4 + 6 = 5 + 5 = 6 + 4P(兩骰點數總和為 10) = 3/(6x6) = 1/12
e)9
= 3 + 6 = 4 + 5 = 5 + 4 = 6 + 3P(兩骰點數總和為 9) = 4/(6x6) = 1/9
10)ABC - CBA = 198
(100A + 10B + C) - (100C + 10B + A) = 198
100(A - C) - (A - C) = 198
A - C = 2
BCAA - ABC
= (1000B + 100C + 11A) - (100A + 10B + C)
= 990B + 99C - 89A
= 990B + 89(C - A) + 10C
= 990B + 89(- 2) + 10C
= 990B + 10C - 178當 B = 9 , A = 8 , C = 8 - 2 = 6 , BCAA - ABC 的最大值 = 990(9) + 10(6) - 178= 8792
2011-11-30 21:19:25 補充:
THANK YOU!!!
2011-11-30 21:43:09 補充:
NO , 我是更正王 , 無論回答與發問 , 同 王子 一樣
2011-11-30 21:52:43 補充:
係係係...王子係烏龍王 , 我才是更正王 , 求你就讓我做更正王吧~
2011-11-30 22:03:54 補充:
哦 ........