In(Inx)的導數怎樣算的?
(ln(lnx))' = 1/lnx *(lnx)' = 1/(xlnx)
求導y=In[In(Inx)]
求具體過程
y'=(ln(lnx))'/ln(lnx)
=((lnx)'/(lnx))/ln(lnx)
=((1/x)/(lnx))/ln(lnx)
=1/[x·(lnx)·ln(lnx)]
設函數f(x)在R上處處可導,已知f(-x)在x=a處的導數為A,則f(x)在x=-a處的導數為.
f(-x)的導函數為f'(-x)*(-1)
f(-x)在x=a處的導數f'(-a)(-1)=A
則f(x)在x=-a處的導數為f'(x)在x=-a處的值f'(-a)=-A
bicycle的複數形式怎麼寫
bicycles
名詞變複數為什麼apple tree變apple trees,Chinese還是Chinese
Chinese單複數相同
apple tree作為一個名詞蘋果樹,變複數按一般規律+s
this is a pear改為複數(要有some)
this is a pear改為複數(要有some)
每一詞語都要變成複數,a在這裡變為some,
所以為:
Those are some pears
It is a pear.(改為複數句子)
They are pears.
i'd like____of pears a a half kilos b half a kilo c one and half a kilo d half kilo
b
one and a half kilos of rice的意思
1.5公斤的大米
Is one and a half days enough for the painting to be finished?
這句話對嗎?
因為前面是IS,可後面卻是用了days,這可怎麼理解呢?
one and a half days雖然可以看做複數,但是作為主語,它表示的是一個單數的概念,要把one and a half days看做一個主體來理解,所以用Is,單數.