5->1 zero 35->1 zero 65->1 zero 95->1 zero 10->1 zero 40->1 zero 70->1 zero 100->2 zeros 15->1 zero 45->1 zero 75->2 zeros 20->1 zero 50->2 zeros 80->1 zero 25->2 zeros 55->1 zero 85->1 zero 30->1 zero 60->1 zero 90->1 zero Reply

老师..那个第五题的答案有错吗….?

2,4,8,…n 的那个general term是2n？

是少了6，我老花看走眼，所以只有杂列的做法。谢谢，加分

老师 第五题的general term 有误吧@@?

没有错！这题有两个做法。一个做法是杂列的做法，一个是普通的summation general term 做法。

不能理解@@..

2r的话那个series不是应该是2、4、6、8….这样的吗? 可是题目是2、4、8、…这样的话不是应该是2^r?

teacher ,How many zeros are there at the end of the number 100! (factorial)??? this how to do?

24 zeros

how to do o ????

5->1 zero 35->1 zero 65->1 zero 95->1 zero

10->1 zero 40->1 zero 70->1 zero 100->2 zeros

15->1 zero 45->1 zero 75->2 zeros

20->1 zero 50->2 zeros 80->1 zero

25->2 zeros 55->1 zero 85->1 zero

30->1 zero 60->1 zero 90->1 zero

thank you teacher

teacher how to find the area of y²=x(x-4)² ??

not area = 2∫ y dx from 0 to 4 ???

where y =x(x-4)²

This curve likes an “alpha” shape?! In S1S textbook you can find it.

teacher ,which question need not to do in miscellaneous 5???

misc5 Q19,21,23,25 no need to do

teacher , if “good” is spelled wrong, how many set it can wrong ?? this how to do?

4!/2! – 1 = 11 sets