冪函數(shù).一個(gè)判斷,
冪函數(shù).一個(gè)判斷,
當(dāng)冪函數(shù)a=-1時(shí),冪函數(shù)y=x^a是減函數(shù)、
當(dāng)冪函數(shù)a=-1時(shí),冪函數(shù)y=x^a是減函數(shù)、
數(shù)學(xué)人氣：653 ℃時(shí)間：2020-05-23 21:13:36
優(yōu)質(zhì)解答
[定義]一般地,設(shè)函數(shù)f(x)的定義域?yàn)镈,如果對于定義域D內(nèi)的某個(gè)區(qū)間上的任意兩個(gè)自變量的值x1,x2 ,當(dāng)x1 f(x2),那么就說f(x)在這個(gè)區(qū)間上是減函數(shù).此區(qū)間叫做函數(shù)f(x)的單調(diào)減區(qū)間.a=-1y=x^a=1/x變成了反比例函數(shù).令 x...
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