令√3-4x=u,那么x=(3-u^2)/4
f(x)=2x+1+√(3-4x)
=(3-u^2)/2 + 1 + u
=(-1/2)u^2 + u + 5/2
=(-1/2)(u-1)^2 +3
明顯u≥0,所以f(x)在u=1時(shí)有最大值3,其值域?yàn)椋?∞,3】
設(shè)置u的目的是將根號(hào)去掉,其實(shí)還有其他的辦法
f(x)=2x+1+√(3-4x)的值域,
f(x)=2x+1+√(3-4x)的值域,
數(shù)學(xué)人氣:652 ℃時(shí)間:2020-06-23 13:06:33
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