total 8 people attend 4 swimming competitions. in each competition, positions have the following points:first has 20 points, second has 15 points, third has 12 points, forth has 9 points, fifth has 6 points, sixth has 4 points, seventh has 3...澳洲华人论坛
四个大人和5个孩子坐在一个圆桌上，大人里面有一个不愿意跟孩子相邻坐，孩子里面有一个不愿意和大人相邻坐，有几种排法？ 我的答案是P4(4)P4(2) P3(2)，和我家孩子是不同，我怎么觉...澳洲华人论坛
如图。 评论 我觉得我飘的太厉害了。。这样的帖还敢点进来看看自己会不会 评论 是A吗？三个L在一起，剩下只有5个位置，所以是5x4x3,然后再乘6，和答案A一样。 评论 A 评论 3个L放一起...澳洲华人论坛
3枝花插在三个不同的花瓶里有多少种组合？ 四枝插三个瓶呢？四枝插四个瓶呢？ 评论 C33 C43 C44好像是吧 评论 请问：是教多大（或几年级）的孩子？ 如果是大人的话就套一下排练组合...澳洲华人论坛
请教各位下面题的解题思路 we had to design a colour code for all the books in our class library. we decided to have 5 stripes on each book, we could colour each stripe in one of the three colours. it didn't matter if more than on...澳洲华人论坛