07 mc ce maths Q.27.Q53,Q54
解釋比我聽
07 mc ce maths Q.27.Q53,Q54
2007-12-23 2:12 am
回答 (2)
2007-12-23 3:10 am
✔ 最佳答案
27. sum of exterior angles of any polygon is degree 360.180x(n-2)=4x360
n=10
53. there are 13 balls.
P(both black balls)+P(both white balls)
(8/13)x(7/12)+(5/13)x(4/12)
=19/39
54.P(different letters)
=1-P(same letters)
=1-[(1/4)x(1/4)+(1/4)x(1/4)]
=7/8
收錄日期: 2021-04-26 13:16:12
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071222000051KK03281