一般地,y=xα(α為有理數(shù))的函數(shù),即以底數(shù)為自變量,冪為因變量,指數(shù)為常數(shù)的函數(shù)稱為冪函數(shù)。例如函數(shù)y=x0、y=x1、y=x2、y=x-1(注:y=x-1=1/x、y=x0時x≠0)等都是冪函數(shù)。在AP微積分課程中,關(guān)于冪函數(shù)的應用也是非常常見的,下面A加未來小編就帶大家一起來分析一下這一重要的AP微積分考點,希望對大家有所幫助。
1.Power Functions冪函數(shù)y=xμ(μis a constant)
(1)Whenμ=n(where n is a positive integer)
When n is even,the function is also an even function(偶函數(shù));
When n is odd,the function is also an odd function(奇函數(shù));
(2)Whenμ=(where n is a positive integer)
When n is even,the domain of the function is(0,+∞);
When n is odd,the domain of the function is(-∞,+∞);
The following figure are the graphs of the functions whenμ=-1,,1,2.
2.Polynomial Functions多項式函數(shù)
多個冪函數(shù)進行加減乘運算即得到多項式函數(shù),記為:
f(x)=a0xn+a1xn-1+a2xn-2+…+an-1x+an(n is a positive integer or zero)
n=1,linear function(一次函數(shù)),f(x)=kx+b(k≠0)
n=2,quadratic function(二次函數(shù)),f(x)=ax2+bx+c(a≠0)
n=3,cubic function(三次函數(shù)),f(x)=ax3+bx2+cx+d(a≠0)
3.Rational Functions有理函數(shù)
二個多項式函數(shù)進行除運算即得到Rational function,記為:
f(x)=(Q(x)≠0)[P(x)and Q(x)are polynomial functions]
以上就是A加小編關(guān)于AP微積分考點中有關(guān)冪函數(shù)的一些內(nèi)容指導,同學們是不是已經(jīng)很好的掌握了呢?更多AP微積分課程學習問題,歡迎隨時咨詢我們!