函數(shù)y=log2（x2-4x）的單調(diào)遞增區(qū)間是_．
函數(shù)y=log2（x2-4x）的單調(diào)遞增區(qū)間是______．
數(shù)學(xué)人氣：778 ℃時(shí)間：2019-11-18 20:05:15
優(yōu)質(zhì)解答
根據(jù)題意，函數(shù)y=log2（x2-4x）分解成兩部分：f（U）=log2U外層函數(shù)，U=x2-4x 是內(nèi)層函數(shù)．根據(jù)復(fù)合函數(shù)的單調(diào)性，可得若函數(shù)y=log2x單調(diào)增函數(shù)，則函數(shù)y=log2（x2-4x ）單調(diào)遞增區(qū)間就是函數(shù)y=x2-4x單調(diào)...
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