但佢要show 到個relation between (a) and (b)出黎 本帖最後由 bunbunbunbun 於 12-9-2010 17:46 編輯
回復 8# p445hkk20001
method of difference
Its much more useful when doing summations involving partial fractions
I reckon this is an example only
basically part a shows that f(x)= g(x)-g(x-1)
so summing f(x) from a to b = summing g(x)-g(x-1) from a to b = g(a) - g(a-1) + g(a) - g(a) +g(a+2)- g(a+1)+...+g(b) -g(b-1)=g(b)-g(a-1) 回復p445hkk20001
method of difference
Its much more useful when doing summations involving parti ...
bunbunbunbun 發表於 13-9-2010 01:40 http://www4.nakuz.com/bbs/images/common/back.gif
Actually, we have not learnt such a Method of difference in M1/M2@@
In that case, using basic concept of summation is already enough.
They may not ace the mothod that you've told.
頁:
1
[2]