求救!! 1.f( x + h )....f( x )有咩

2009-12-31 7:39 am
求救!!
1.f( x + h )....f( x )有咩關係?
點解f( x ) = 3x^2 + 5x -6 代入去[f(x+h)-f(x)]/h

結果係[3(x+h)^2+5(x+h)-6]-[3x^2+5x-6]

2. A SIR講過 當f(x)=4
f(1)=4 + 0*1 =4
f(x+h)=4+0*(x+h)=4
唔明點解會咁...

3.一條數唔識做~ lim [1/x-1/4]/2(x-4)
x>4

回答 (2)

2009-12-31 7:28 pm
✔ 最佳答案
As follows:


圖片參考:http://i.imagehost.org/0348/ScreenHunter_02_Dec_31_11_17.gif
2010-01-01 8:05 am


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