secondary math again plz

2013-08-14 7:57 am
呢種題目完全100%唔識
Calculate 2012/2011 x 2011/2010 x 2010/2009 x....x 3 /2x 2/1
更新1:

and briefly explain how you get the answer

回答 (1)

2013-08-14 8:20 am
✔ 最佳答案
ans.= 2012

你試試簡單的:

(5/4) X (4/3) X (3/2) X (2/1)
=(5/4) X (4/3) X (3)
=(5/4) X (4)
=5
=第一個括號分母的數

2013-08-14 00:20:51 補充:
第一個括號分子的數先岩- -

2013-08-14 00:25:53 補充:
呢條數教識我地: 凡事唔一定要由頭做起 hahaha......

2013-08-14 01:03:03 補充:
見你俾20分,post多d野先@@

呢d題目都唔係由頭計起:
99+98+97+96+95......6+5+4+3+2+1

設A= 100+99+98......3+2+1 ------(1)
所以A= 1+2+3......98+99+100 ------(2) (倒寫一次)
(1) 加(2) :
A= 101+101+101......101+101+101 (共100個)
=101x100
=10100

2013-08-14 01:05:30 補充:
寫錯...
(1) 加(2) :
2A= 101+101+101......101+101+101 (共100個)
2A=101x100
2A=10100
A=5050


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