數學簡單問題!!!!5分

請問可唔可以加括號?

2013-06-17 18:55:58 補充：
我諗到一個唔用次方數的方法：

5C(5-5)
=5C0
=1

Additional information:

C is combination (組合)

In mathematics a combination is a way of selecting several things out of a larger group, where (unlike permutations) order does not matter.

nCr
= n!/[r!(n-r)!]

! is factorial

In mathematics, the symbol represents the factorial operation.

n! = n*(n-1)*(n-2)*...*3*2*1

0! =1 (definition)

Therefore,
5C0
=5!/[0!(5-0)!]
=5!/5!
=(5*4*3*2*1)/(5*4*3*2*1)
=1

上面睇唔明唔緊要。簡單啲講，5C0=喺5樣嘢度揀0樣嘢嘅組合總和。喺5樣嘢度揀0樣嘢只有一個組合，就係咩都唔揀，所以5C0=1

5( / )5 (log(base 5)) 5

5Log_9765625 5 *5

只需兩個方法？還是要列舉所有方法？

2013-06-14 22:47:51 補充：
不如先公布要給出多少不同的解

不可有次方喎，開方 = 半次方。

5/開方(5x5)=5/5=1

2013-06-15 21:22:26 補充：
可以用指數表示開方根
唔等於開方根係指數
咁5x5=5^2
乘號都係指數姐

我仲以為只係唔可以變成5^5^5