請問,pure math paper2 sectionB第一條咪好鍾意出graph既~
佢會比一條 f(x) 既公式你,然後叫你畫番條f(x)出黎
咁咪會叫你搵f ' (x)>0 同 f " (x)>0 既情況既
我想問,通常佢都係比三四分度,
咁我係咪唔使寫steps呢??係咪就咁比個答案佢都有分攞呢??
如f " (x)>0 when x>1 咁就有分?其他steps可以唔寫??
有關pure math paper2既問題(20點)
2007-04-15 8:36 pm
回答 (2)
2007-04-16 11:27 am
✔ 最佳答案
理論上來講是正講的。因為看它的marking是這樣做
不過個人認為可以寫多少少(以15秒為限)
主要你要show到f''(x)=0 的解是甚麼
For example
let f''(x)=0 then (x-1)=0 ,x=1
f " (x)>0 when x>1
f " (x)<0 when x<1
以上是個人意見僅供參考
2007-04-17 4:23 am
I think you should shows the table of signs of f'(x) and f''(x)
But you will score no marks here.
Usually three marks will be allocated in 4 answers for the ranges of x such that f'(x) > 0, f'(x) < 0, f''(x) > 0 and f''(x) < 0
But you will score no marks here.
Usually three marks will be allocated in 4 answers for the ranges of x such that f'(x) > 0, f'(x) < 0, f''(x) > 0 and f''(x) < 0
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