f(x)=-2x²+4x+1
=-2(x^2-2x+1)+3
=-2(x-1)^2+3
f(x)max=f(2)=1
f(x)min=f(4)=-15再詳細(xì)點(diǎn)吧~ 嘿嘿先化簡(jiǎn)f(x)=-2x²+4x+1=-2(x-1)^2+3對(duì)稱(chēng)軸x=1,開(kāi)口向下x=1是f(x)圖象的最高點(diǎn)但x的范圍是【2,4】【2,4】在x=1的右面f(x)max=f(2)=1f(x)min=f(4)=-15
求函數(shù)f(x)=-2x²+4x+1在區(qū)間【2,4】上的最值
求函數(shù)f(x)=-2x²+4x+1在區(qū)間【2,4】上的最值
數(shù)學(xué)人氣:271 ℃時(shí)間:2020-02-05 09:59:40
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